Knowledge, Competences and Competitive Advantage of the Green-Technology Companies in Poland

The article deals with the issue of competitive advantages based on the knowledge of Polish green-technology companies. It aims to identify the sources of knowledge and indicate companies’ competences in acquiring knowledge, which are believed to be the basis of their market success. Empirical research presented in this article was based on qualitative studies using in-depth interviews. The obtained results allowed to identify the most important sources of knowledge that can be structured into the following pillars: research and development works, knowledge on the competitors, customers and recipients, green technology domestic market, and foreign markets for green technologies. Moreover, it allowed to identify the competences of green-technology companies in Poland and describe the process of acquiring these competences. The analysis of the collected data and the obtained results allowed to create a model of acquiring new knowledge by green-technology companies in Poland, which serves as a basis for these companies to gain distinctive competences.


Introduction
The competitive advantage of companies based on knowledge and competence has been analyzed in management studies for a long time. The most important theoretical concepts concerning this topic include the resource-based theory, derived from strategic management, as well as knowledge management. According to Li et al. [1], the resource-based theory highlights continuous value creation functions of co-operation under accordingly varied organizational capacities and diverse organizational resources. This is done to establish innovation processes in order to combine internal inputs with external ones and to create business value leveraging [2]. According to Conchado et al. [3], knowledge of management constructs constitutes a novelty with regard to the traditional division of generic and specific competences and it is composed of learning processes and specific competences. Knowledge is dynamic and its value varies with regard to place, time, context and the manner of its use. Without these characteristics it is simply information and its meaning and value for the company is challenging to define [4]. Nevertheless, focusing on knowledge management may support companies' ambidexterity and competitiveness [5].
Following this framework indicating the importance of time-and context-specific analyses, several contributions have been made by various authors, describing the aspects of knowledge and competences of green companies in the case of the following countries: China [6][7][8][9][10][11][12][13][14], Australia [15], Brazil [16], Canada [17], Finland [18], Germany [19,20], India [21,22], Japan [23], Malaysia [24][25][26][27][28][29][30][31], Pakistan [32][33][34][35][36][37], Romania [38], Slovakia [39], Asian-Pacific area (including Taiwan, South Korea, China, Hong Kong, India) [40] and European countries (including France, Germany, Italy, the Netherlands and the United Kingdom as one group) [41]. This study attempts to follow this framework and build on the research findings related to the knowledge and competences of companies (from the perspective of resource-based theory) [42][43][44] and knowledge management in organizations [45][46][47] (especially since the survival of companies largely depends on significant investments in knowledge management [48]). Although important contributions tackling the characteristics of green-technology companies based outside of the Central and Eastern European (CEE) region have been made, there are only a few describing CEE companies-e.g., [39]. Studies concerning Poland with a specific focus on green technology suppliers and their knowledge and competences are still rare [49]. Thus, this paper seeks to fill this gap and aims to identify sources of knowledge and competences in the field of knowledge acquisition and management used as resources which could account for the success of Polish green-technology companies. This empirical research focuses on: • the identification of the knowledge and competence sources in Polish green-technology companies, • the ways of gaining and developing identified knowledge and competences, • assessment of the importance of identified knowledge and competences.
Moreover, it addresses the following research questions: 1.
What are the knowledge sources of the companies-suppliers of green technologies in Poland? 2.
Which of identified knowledge sources are the most important sources of knowledge for the companies operating on the Polish market? 3.
What type of knowledge is acquired and developed though different knowledge sources? 4.
What are the competences in knowledge acquisition that the green-technology companies in Poland already use? 5.
How green-technology companies acquire knowledge that is necessary to compete on the market?
The research sample was identified among major suppliers of green technologies in Poland. The success of selected companies was based on generating green technology innovations and their commercialization on both, domestic and foreign markets. It should be underlined here that the interrelation between innovation and trade has been a subject of research over recent decades [50]. It should be mentioned as well that green technology is understood here as a type of green product innovation, next to services, organizational structures or management modes adopted by enterprises to achieve sustainable development ( [11] after [51]).
The article is structured as follows. It starts with a discussion on theoretical fundaments of knowledge and competences of companies in the light of resource-based theory and knowledge management, including the process of companies acquiring new knowledge. Then, the research assumptions, goals and research questions are presented along with the adopted research method. Finally, the research results and their significance in the light of the discussed theories of management are presented. The paper ends with concluding remarks.

Knowledge and Competences of Companies from the Perspective of Resource-Based Theory
Resource-based theory, as a concept of strategic management, assesses company's success based on their valuable skills and resources, which include knowledge and competences; however, it is biased due to the companies' ability to use the above-mentioned aspects in a certain way [42]. Representatives of this theory were focused on identification and explanation-which of the resources are stated as important to a particular company and treated as crucial when gaining competitive advantage in the particular market. According to the theory of Jay Barney, the strategic resources could be described as as valuable (V), rare (R), imperfectly imitable or inimitable (I) and not substitutable (N)-namely VRIN attributes [52] (p. 11), [43] (pp. 105-112).
Knowledge and competences of company's employees can be classified as its strategic resources. Thanks to these two types of resources, companies can create new products, technologies and/or services, which allow them to improve their market position. The ability to develop environmentally friendly technologies can also be classified as one of companies' strategic resources, which can bring different benefits to a company at each stage of the value chain [53] (p. 190).
Promoters of the resource-based theory, Hamel G. and Prahalad C.K., treated organizations as bundles of resources and capabilities, whose adequate use leads to development of the core competencies of a company, which then allow development of products and adjustments to the dynamically changing organizational environment and are fundamental to the company's strategic advantage [42] (p. [11][12]. The core competencies of companies include, among others, their unique skills that enable their access to various markets, affect the value of products perceived by customers and are difficult or even impossible to be copied by competitors [54] (p. 83).
Core competencies relate to the development of a company, especially to their potential of creating new product lines and technologies and expansion to new domestic and foreign markets. These competencies should not be treated as related to the final products or technology availability only. Hamel and Prahalad [54] claimed that companies should build their competitive advantage on the level of a whole organization without confining solely to the distinctive units or departments of an organization. Successful use of specific skills, knowledge and abilities of an organization to learn collectively, integrating multiple technology streams and synchronizing multiple production skills can give it significant advantages [54] (p. 81). The hierarchic structure of the resource base of a company includes core assets (having resources), operational capabilities (doing resources), competencies and core competencies [44] (p. 7).
There are many ways, through which companies acquire, create and use knowledge assets. (knowledge assets are the inputs, outputs and moderating factors of the knowledge-creating process, unique resources within the company, which help to create organizational value [14] (p. 20), [2]). From a theoretical perspective, understanding the complexity of these processes eases the categorization of the knowledge sources, according to which the empirical, conceptual, routine and general resources can be distinguished [4] (pp. [20][21][22]. The most valuable knowledge sources are the ones that the company develops itself and other companies have no way to acquire these easily nor quickly from the organizational environment. However, it is not enough to have the right skills, competences, and capabilities. To gain a competitive advantage, companies must also constantly develop them to answer to the new requirements in terms of, e.g., competition, innovation performance, market development. In response to, among others, rapidly changing markets, the concept of dynamic capabilities was developed, which is treated by representatives of strategic management studies as supplementary to the resource-based theory [44]. It emphasizes the importance of the dynamics of the processes of creating a company's competitive advantage by combining and co-ordinating the resources of the organization and their transformation into strategic competences, allowing for the creation of value for the client [55]. Dynamic capabilities include a company's skills to integrate and build internal and external abilities so that it functions efficiently in a dynamically changing environment. These are also abilities to identify and shape opportunities and threats, take advantage of opportunities, maintain a competitive position on the market by increasing, combining, protecting and, if necessary, restructuring tangible and intangible assets of the company [56]. Dynamic capabilities mirror a company's efforts to co-create and shape the market taken to strengthen its competitive position and create added value [57].

Knowledge Management in Organizations and Organizational Learning
The knowledge management as a complement to the resource-based approach has been researched for at least the last two decades [58] (p. 110). Such an opinion is formed by the successive editions of the research on certain issues-e.g., the complementarity and compatibility of the approach were mentioned in Maier [59] (p. 103). Moreover, Curado and Bontis [45] mentioned that a knowledge-based view of a company is an extension of the resource-based view. As the topic of knowledge-based management is still under consideration, it is worth paying attention to the article of Nagano [60] who highlighted the growth of knowledge (management) within the resource-based view framework and the need for a new framework to emerge due to knowledge-based management limitations.
The existence of knowledge in an organization is conditioned by a variety of processes, including its availability, creation, assimilation, sharing, value and management of its flows. An enterprise can acquire knowledge in different ways and from different perspectives. Research and development activities are considered to be the primary sources of valuable knowledge developed in organizations. This type of company self-activity contributes to building its absorption capacity, which in turn helps to identify valuable new knowledge in an organization's environment even more effectively, facilitates its assimilation, and uses the new knowledge for commercial purposes [46] (pp. 128-152). Other possibilities of gaining knowledge include: organizational environment analysis, purchase of reports and analyses, market research, monitoring the activities of key entities from the point of view of their operations, employment, hired staff investments, contact with current and potential partners, competitors, clients, suppliers, distributors, advisors or even mergers and acquisitions. Important sources of knowledge on the economic environment and a particular company's operation market may also include trade associations, specialized press and magazines, stock market analyses, financial statements, reports elaborated by governmental offices and control agencies, government strategies and programs, market reports, various web sources, as well as individual experts (including advisors, scientists and company specialists).
The transfer of knowledge between organizations is an important source of knowledge and can result in heterogenous motivation; however it is worth mentioning that a causal relationship of motivation with innovation performance and mediation of knowledge sharing was found [37]. The most important of these motivations include mimicry, as a result of which companies acquire new knowledge, mobility of human resources between organizations, as well as mutual relations between competing entities, which may foster knowledge interception in the networking process [61] (pp. 613-624). In the scientific literature, there is a theory which indicates the building of knowledge and competences of companies through boundary spanning, what is carried out as a result of the so-called boundary-crossing individuals- [62] after [63] (p. 870), [64]. This indicates that employees' co-operation (among themselves and entities external to their mother-organization) is an important source of knowledge about the organizational environment. These employees are people who accumulate unique knowledge-e.g., through participation in conferences, membership in professional associations, and co-operation with academic communities, although their contacts may also be of a business nature and consist of the company's suppliers, distributors and customers [65] (p. 226). Partner companies, suppliers, customers and competitors, as well as specialists and external experts, including persons representing scientific and research centers, are also among the units and entities important for acquiring new knowledge resources for the organization. In this sense, knowledge acquired from the environment allows to build key competencies of an organization and a competitive advantage by improving the organization's operations based on acquired knowledge, better understanding the customers' needs and determining new possibilities of satisfying them or identifying a way of reaching customers. Therefore, maintenance of relations with individuals and external entities ensures a company acquires knowledge and information about particular market, competitors and changing operating conditions, which serves to make the right management decisions [66] (p. 247).
The most important ability of a company that focuses itself on competitive knowledge-based advantages development is an accurate identification of necessary knowledge, as well as its efficient transformation and implementation [47] (p. 252). In this process, the most demanding and complicated matter is to distinguish between the layers of knowledge that are worth keeping as a company business secret and those that can be shared by building the company's own network of co-operation around the organization [67] (pp. 109-128). Companies seeking to effectively acquire and use knowledge in their activities should systematically undertake the following actions [68] (p. 132):

1.
Identification of knowledge domains that are critical to the company's operations.

2.
Identification of how these domains are related to each other.

3.
Assessment of the company's competences and skills in these knowledge domains-i.e., its ability to integrate streams of knowledge within and across such domains.

4.
Assessment of the company's competitive position in those knowledge domains-both the firm's relative coverage of the domains as well as its relative integration skills. 5.
Exploration of the possible future evolution of these knowledge domains and the integration challenges that such an evolution will pose for companies operating in these domains. 6.
Identification of the company's strategic options given by this evolution and the company's current competitive position. 7.
Assembly and pursuit of a knowledge development strategy to create knowledge-based advantages that would deliver corporate competitiveness.
Green-technology companies in Poland have distinctive knowledge and competences, the sources of which can be found both within the organizations and in their environment. Companies acquire knowledge from specific sources in order to implement the organization's visions and strategic objectives in the long term. This knowledge concerns the improvement of technology and production, ways of company functioning, local and international market expansion and improvement of the company's competitive position [69] (pp. 265-274). The internal sources of knowledge in a particular company include its current and former employees of all departments, specialists and experts with diverse backgrounds who constantly co-operate with the company. The external sources provide knowledge from participants of the green technology market, government offices and institutions, associations of companies and industries, international organizations, as well as scientific and research centers and universities. These sources also include publications in scientific and industry magazines and presentations at scientific conferences and various events (e.g., trade fairs, conferences, seminars). Politicians and government officials also provide important information connected to changes in legislation, creation of environmental standards and other various findings-e.g., in the climate negotiations process.
In addition, the following types of documents can become sources of knowledge for companies: • publicly available reports and market analyses, • reports and analyses prepared by organizations associated in a specific profile, • reports and analyses commissioned for a particular company, • reports and analyses prepared by company employees, • results of public tenders, • financial statements and stock exchange information, • trade publications, press releases, • information and promotional materials for competitors.

Materials and Methods
The aim of the research was to identify the companies' knowledge sources among environmental technology suppliers and list the most significant ones, as well as present core competences of companies in the new knowledge acquisition process, which allow them to successfully compete in the market and also impact the strategy and strategic goals, such as new technology development, improving technology solutions, increasing sales and market expansion.
The additional aim of the article was to find answers to the following research questions: 1.
What are the knowledge sources of the companies that are suppliers of green technologies in Poland? 2.
Which of identified knowledge sources are the most important sources of knowledge for the companies operating on the Polish market?

3.
What type of knowledge is acquired and developed though different knowledge sources? 4.
What are the competences in knowledge acquisition that the green-technology companies in Poland already present and use? 5.
How do green-technology companies acquire knowledge that is necessary to compete on the market?
This study was part of a larger research project entitled Green Technology Accelerator-GreenEvo (GTA GreenEvo), led by the Polish Ministry of Environment. The project was aimed at supporting the international transfer of environmentally friendly technologies and also concerned the analysis of experiences of Polish companies that are suppliers of environmental technologies in creating innovations. The specific objectives of the project included the analysis of the processes of development, promotion, sale and implementation of environmental technologies by companies that are suppliers of environmental technologies in Poland [70]. Due to the uniqueness of the project, which required the identification and analysis of a broad spectrum of topics, the research was carried out with the use of qualitative methods. The data were collected through in-depth interviews (monads, dyads and triads [71]) with companies' representatives, and the companies they represent were the units of analysis. The semi-structured and semi-standardized in-depth interviews included over 100 detailed questions and raised a number of issues covering the following topics: introduction (7 questions), company technologies (12 questions), establishment of the company (6 questions), capital and investors (9 questions), implementations (3 questions), users (5 questions), sales process (9 questions), sources of success (6 questions), marketing (12 questions), sales (18 questions), customers (7 questions), foreign markets (8 questions), choice of markets (3 questions), relations with foreign clients (5 questions), implementation projects (10 questions), research and development (10 questions), co-operation with universities (9 questions), employees (9 questions), suppliers (2 questions), patents (17 questions), sources of innovation (4 questions), competitors (7 questions), analyzes (11 questions), certificates (4 questions), problems abroad (5 questions), public support (13 questions), and future (3 questions). The interviewees had the opportunity to interview companies' representatives freely using an interview questionnaire. The interviews were carried out according to the logic of "one company-one interview", although sometimes several interlocutors took part in certain interviews. The interviewees were company managers-owners, board members, and sales directors or product managers in the case of larger companies. In total, 40 interviews in 40 companies were conducted. The average duration of an interview was 157 min, but the longest was conducted for 266 min. The total duration of all interviews was 6280 min (104 h 40 min). All interviews were recorded and then transcribed. The relevant excerpts from the transcribed documents were encoded using a code book of 77 elements and analyzed using NVivo Software (version 10, QSR International, Melbourne, Australia) [72,73]. The analysis results presented in this article include information collected with the use of 15 codes specified in Table 1. The whole research was carried out in line with the grounded theory approach [74].
The empirical data used within this research project were gathered based on the experiences of the Polish companies that are suppliers of environmental technologies, laureates of three editions of the competition GTA GreenEvo. The research sample was composed of the winning companies, which were selected by a group of independent experts based on the criteria of uniqueness and quality of the technology offered by these companies, with the preliminary requirement related to their production abilities and holding Polish capital.
The selected companies also stand out from other companies in the Polish environmental technology industry because of their employment structure. They engage on average over 50 employees, whereas more than 40% of companies from the industry in Poland employ less than nine people, and around 40% employ 10 to 50 employees.

Foreign Higher Education Institutions
Co-operation with universities and research institutes from abroad The selected companies represented six broad areas of environmental technologies: renewable energy sources, water and sewage management, waste management, biodiversity protection, energy saving and air protection. Detailed characteristics of the companies are presented in Table 2. The researched companies are located countrywide with the predominance of the Mazovian/Mazowieckie Voivodeship (8 companies) and the Silesia/Śląskie Voivodeship (7 companies

Results
Customers and end-users are perceived as the most important sources of knowledge on the green technology market and environment by the interviewed companies. Significant knowledge resources coming from these entities are obtained, inter alia, by conducting analyses of customers' needs. However, this research showed that one-third of the interviewed companies did not carry out analyses of customer needs, while in the remaining cases such analyses were carried out by the organization's employees but obtained knowledge was not expressed in any formal documents. In most cases, in the interviewed companies, the analyses of customer needs consisted of maintaining appropriate relations (responsibilities of the sales departments employees) with customers and end-users. In all the interviewed companies, the interlocutors agreed that the knowledge connected to the expectations of customers and end-users are formed as result of the experience gained by the companies and the relations built on the basis of honesty, trust and direct contact. It was a rare practice among the researched companies to outsource the analysis of customer needs to external entities (as it might be concluded based on, e.g., the interview which the representative of Company 10 quoted above), and even if it was declared in a given company, the results of these analyses did not meet the expectations and were characterized by a very low quality. Therefore, from the perspective of the companies, it seemed more advantageous to carry out analyses of customer needs rather than task the company's own employees from marketing and trade departments. It turns out that knowledge acquired in this way is usually not codified and does not take the form of a document. Only a few companies' representatives admitted writing down comments and observations resulting from the analysis of customer needs.
In some of the represented green technology industries, in companies whose customers are not end-users of a particular technology, the analyses of customer needs are carried out by external organizations, including industry associations or other entities associating companies with similar profiles. Then, the necessary analyses are readily available for inspection by parties of interest-they are presented in the strategies of a given industry or government programs. In such situations, entrepreneurs rather rely on the available knowledge and resign from the maintenance of their own research.
"In fact, our company did not carry out such targeted analyses, as we know, these needs are known in advance. One of the competencies held and developed by two-thirds of companies is therefore the analysis of customer needs. This competence is shaped by companies as result of analyses carried out by individual company employees and by using generally available information contained in various publications. Therefore, in the majority of companies, analyzing the expectations of the recipients is carried out by their employees who, on the organization's request, search for relevant information directly through the clients and recipients or use the available publications for this purpose (as, e.g., in the case of Company 37 quoted above). In rare cases, companies outsource relevant analyses to third parties.
The vast majority of companies claim that customers are an important source of organizational knowledge and are an inspiration for improving not only technological solutions but also the ways of presenting technologies and sales processes. Customers' ideas can become an inspiration for the improvement of existing products (as representative of Company 19 stated; quoted below) or new ones' creation, and moreover for the initiation of certain improvements in technology implementation, sales processes or complementary technologies.
"We learn a lot from our customers because they really tell us where to develop our product."

[Company 19]
A specific type of customers are institutional customers, who often have a very low level of knowledge on the technology they are acquiring and their lack of knowledge does not allow them to compare technological solutions. This type of customer usually makes purchasing decisions based on the price criterion. More than one-third of the interviewed companies are convinced that the customers do not have the knowledge that would allow them to properly evaluate technological offers. Nevertheless, some of the companies from the sample contribute to expanding customers' knowledge through their education and training. Such actions have in some cases allowed the companies to gain a competitive advantage (e.g., Company 38 cited below).
"Customers who are beginning to take an interest in this knowledge choose our company because it is difficult to get this knowledge [that we have-noted by transcriber/authors]. This is our asset. When talking to a client, we open up to their needs, we explain as many substantive problems and solutions as possible in a way that the client can understand. This encourages cooperation with us." [Company 38] Competence in gaining new knowledge about customers and their needs is thus expressed by the ability of companies-green technology suppliers/providers-to conduct sales discussions with customers. Moreover, the way in which the sales competence of companies develops includes an appropriate presentation of the benefits of a particular technological solution, which is easy to understand for the customer.
Another important source of knowledge for green-technology companies are partners who enable them to gain knowledge and information connected to the market (as adaptation to local conditions mentioned by representative of Company 5 quoted below) and point out ways and means of improving the technology offered by the company and support the company in adapting its technology to specific conditions. "[Partners contribute-noted by transcriber/authors], most often by asking us specific questions, or saying that it is standard for us to have something there, and how would you solve it. It's always an adaptation to local conditions." [Company 5] Relationships with partner companies are an important way of shaping competences in the area of acquiring new knowledge. Shaped relationships enable companies to improve their competence in adapting their technological solutions to local conditions (as mentioned by representative of Company 5 quoted above), and this translates into the possibility of market expansion and increased sales.
Companies' competition may also become an important source of knowledge. Companies may gain knowledge on their competitors by using reports prepared on behalf of the company or by purchasing reports prepared by external entities. Only a few companies have been decided by the latter-day solutions. In their opinion, overall reports mainly contain summaries of certainly known information. Three-quarters of the interviewed companies do not purchase reports, and in the opinion of one-third of them, studies on competition prepared by the company's employees or information published in open sources are more reliable.
From the perspective of the analyzed companies, the local market in which they operate is limited, which makes their knowledge-resulting from experience, co-operation with customers and partners (including suppliers and distributors)-sufficient enough to meet their needs and carry out their own analyses. Some companies argue that it is one of the reasons why they do not outsource market reports to other entities (e.g., Company 8 quoted below). "We know more or less the scale of the market in Poland. We know how much [certain product name-erased by transcriber/authors] is sold, how much we produce, how much share we have, and we know what is available. This market is known to us, so there is no information that we would be so interested in." [Company 8] This is different when it comes to gaining knowledge on international markets. Companies are willing to gain knowledge about foreign markets (e.g., Company 23) or make a declaration using various reports. Unfortunately, according to the companies represented in the sample, an important limitation is the availability of reports and budget constraints (e.g., according to representative of Company 23 quoted below), which do not allow them to hire an external company in order to prepare an appropriate report. The interviewed companies gain knowledge on the competitors' actions through the analysis of available documents about the companies and their products and participate in trade fairs that enable companies to meet their competitors and analyze the results of public procurement procedures (e.g., Company 6). In the interviewed companies, competition analyses are most often carried out on the basis of their own resources, including telephone conversations with competitors or press articles, information and advertising materials and websites. To sum up, competencies in the field of competition and market analysis are shaped by companies with the use of analyses developed by their employees. When developing this competence, relations with both customers and partners are important. Competence in the field of international market analysis is less frequently demonstrated by enterprises of green technology suppliers in Poland. The lack of this type of competence makes these companies more likely to use analyses developed by external entities.
An important source of knowledge from the point of view of green-technology companies are European and domestic laws and draft legislations. In total, 35 companies in interviews stated that they monitor changes in legislation and follow the work on emerging legislation, both on a domestic/internal and European level. Some of them also follow the course of climate negotiations, changes in European Union regulations or even co-operate in consulting on laws concerning the companies' operation area (as, e.g., in the case of Company 20, which representative is quoted below). In some of the interviewed companies, monitoring changes in legal regulations is the responsibility of the legal department, which operates in a small number of the interviewed companies. In a significant part of the interviewed companies, legal offices are hired (as, e.g., in the case of Company 6) in order to monitor changes in legal regulations that are important for these companies. Competence in the analysis of legal regulations and changes is delegated to institutions co-operating with companies-e.g., law firms and law offices. Environmental technology providers in Poland are not able to identify, analyze and apply regulations related to the specificity of their business.
The interviewed companies declare that they participate in seminars and industry conferences. More than a quarter of them claim that they participate in specialized conferences on narrow issues, most often as speakers, but they are not a source of new knowledge for the company (according to comment of Company 38 s representative quoted below). An important problem for the interviewees was to distinguish between scientific articles presenting research results and publications in trade journals, popular and scientific literature or content already available on web portals. Unfortunately, many of the interviewees confused industry reports with scientific research results, which are most often presented in scientific journals. This is undoubtedly a limitation of these companies' research that they carried out.
Another way of gaining knowledge by the interviewed green-technology companies are maintenance relations with journalists who publish, for example, in the trade press and industry web portals. More than three-quarters of companies declared that they subscribe and read trade journals (as, e.g., representative of Company 32 declared (quoted below)), contrary to scientific journals. Companies gain new knowledge and shape their competences to achieve strategic goals by participating in conferences and industry seminars, reading trade publications and partly by following the development of science and research in the area of their interest.
To sum up the research outcomes described above, the summary of the most important results is presented in Table 3. Table 3. Summary of the most important research results. Source: Own elaboration.

Types of Knowledge Sources Acquired Knowledge Companies' Competences in Acquiring Knowledge
Customers and end-users a.
Knowledge on the expectations of customers and end-users necessary to create new and improve current technological solutions and their implementation processes; b.
Knowledge of the market and competition a. Customers' needs analyses (internal, open to the public and outsourced); b.
Appropriate relations with customers and end-users; c.
Skillful sales processes-e.g., enabling comparison of two technologies and benchmarking Competition, local and foreign markets a.
Knowledge of a company's environment; b.
Knowledge of competitive technological solutions and competition; c.
Knowledge of the market in which the companies operate and the foreign markets in which particular companies want to be recognized a.
Reports prepared by companies and commissioned to external entities; b.
Reports ordered by companies; c.
Analysis of available documents on companies and their products-e.g., press articles, information and advertising materials, and websites content; e. Participation in trade fairs; f.
Analysis of the results of public procurement procedures Other sources of knowledge: 1.
Changes in legislation, creating new ecological standards and following the climate negotiations; 2.
Scientific articles and tracking of scientific development in particular company's area of interest; 3.
Trade press, seminars and conferences a.
Knowledge of the market's changeability, competition and company environment; b.
Knowledge of the possibilities of creating new and improvement of current technological solutions and processes of their implementation a.
Ordering legal services and monitoring of law regulations to legal offices and law firms; b.
Co-operation with scientific institutes and universities; c.
Tracking the trade press; d.
Participation in seminars and industry conferences

Discussion
In this paper the authors took into consideration resource-based theory and knowledge management (which are complementary-the knowledge-based view of a company is an extension of the resource-based view [45]) as thus refer to these frameworks-e.g., [1,3]. Identification of sources related to knowledge, competences and competitive advantages acquisition and management was listed among the main premises of this article. These premises were considered in the context of deliberation on Polish green-technology companies' success.
As it was mentioned in Section 2 of this paper, representatives of resource-based theory were focused on identification and explanation-which of the resources are stated as important to a particular company and treated as crucial when gaining a competitive advantage in the particular market. The collected qualitative data enabled the identification of the most important sources of knowledge in green-technology companies in Poland, which constituted the basis of their key competences and thus enabled them to build a competitive advantage. Moreover, the sources of knowledge distinguished by the interviewed companies refer to the relations created by the analyzed companies with market participants and other entities and the knowledge about the market and its participants gained through these relations and other available information. The analysis of the collected data and the obtained results allowed to create a descriptive model for the acquisition of new knowledge by green-technology companies in Poland, which serves as a basis for gaining distinctive competences by these companies. Core competencies [54] and dynamic capabilities [44] arising from the various identified knowledge sources enabled companies to access various markets (also outside Poland) and helped them to grow and develop their portfolios. Based on the presented research, it can be stated that green-technology companies in Poland are consciousness of their knowledge and treat it as an important asset of their competitive advantage.
In order to summarize the results of this qualitative empirical research, it can be concluded that, currently, the organizations' employees are most often responsible for gaining new knowledge (especially those employees, who co-operate directly with other market participants-e.g., partners, suppliers, distributors, customers and end-users). These daily business contacts become a source of knowledge about the organization's environment, including, i.e., the competition and the needs of current and future customers and recipients. In this way, the gained knowledge leads to the improvement of a particular company's current technology and product offerings and is used in order to improve implementations, organize the sales process, and create products and services complementary to the offered technology. Foreign partners who support companies in modifying and adapting their technology to the expectations of foreign customers and recipients are also an important source of knowledge related to the development of green-technology companies, especially when it comes to their international expansion. Competence in gaining new knowledge on customers (and other stakeholders) and their needs is therefore core to the development of green-technology companies. Such knowledge becomes an asset of companies, which are conscious of inputs, outputs and moderating factors of the knowledge-creating process, and unique resources within themselves [4].
Numerous interviewed companies used readily available, inexpensive, or even free-of-charge industry publications-e.g., industry magazines, web portals and reports provided by industry associations. The financial issue was important for reports on foreign markets, where companies declared their willingness to purchase a report; however, they decided not to take advantage of this opportunity due to the high costs of such a service and their own budget constraints. Polish green-technology companies, instead of using already available reports on markets, monitor the market with their own expenditure, primarily preparing their own analyses of customer needs-gathering knowledge about what the competition offers-based on information from trade fairs and materials (e.g., on the website or in the trade press) made available by competitors, and the results of public procurement procedures. However, these companies rarely documented their observations, remarks, and reflections in permanent forms of corporate notes and documents. Thus, the use of this knowledge depends widely on the competences of a company's employees who gathered relevant information.
As far as the knowledge and competences of a company's employees regarding strategic resources are concerned, companies gain new knowledge and shape their competences to achieve strategic goals by use of analyses developed by their employees, by relations with both customers and partners, by customers' opinions, by participating in conferences and industry seminars, by reading trade publications and partly by following the development of their scientific and research abilities in the area of their interest.
The companies also try to monitor the relevant legislation on their own, the course of climate negotiations and the creation of new ecological standards. Some companies are involved in consulting on new legal projects. Knowledge concerning changes in the law is acquired by the employees of legal departments of the largest interviewed companies, while the remaining companies benefit from the support of legal service offices and law firms.
Therefore, the interviewed companies develop competence in the area of acquiring new knowledge concerning their competitors, clients and recipients, markets and possible changes within markets, using the identified sources of knowledge.
The ability to use particular sources of knowledge enables companies to create new products, services and technological solutions, as well as enter new markets and increase sales. In general, these translate/transpose into the products, services and technological solutions offered, with the possibility of their improvement and adaptation to local conditions, and thus into their position in the market and their competitive advantage. Therefore, most of the competences in the area of knowledge acquisition are formed within enterprises, while very few require co-operation with external entities,-e.g., law firms and law offices. However, there is still some potential for exploitation of other opportunities and making companies aware that they can expand their package of key knowledge acquisition opportunities to increase their skill and competences.
The results of the conducted research are summarized in Figure 1, which presents a model of acquiring new knowledge by green-technology companies in Poland, which serves as a basis for gaining distinctive competences by these companies.
Nevertheless, a large group of countries is not analyzed in this context, even briefly. This conclusion is based on the analysis of publications collected in the Scopus and the Web of Science databases. In the Scopus database, 87 publications were obtained in total, and 34 in the Web of Science, in most cases the same. Each of the publications' contents have been reviewed in terms green-technology companies and only those that have been flagged are consistent with the topic analyzed in the article. The numbers are small, and no analyses has been carried out for most of the countries. This is the basis for future research-namely, to analyze companies in countries not included in the above-mentioned list. This will be the subject of further research by the authors of this article or may inspire other researchers. Although this paper discusses the Polish market only, it may be mentioned that, e.g., a green entrepreneurial orientation had positive influences on both the environmental and financial performance of companies, which is one of China's research results [6]. The content-based analysis of publications describing the operations of green-technology companies on other markets shows that such contributions are rather rare and are available only for some countries,-e.g., for China [6][7][8][9][10][11][12][13][14], Australia [15], Brazil [16], Canada [17], Finland [18], Germany [19,20], India [21,22], Japan [23], Malaysia [24][25][26][27][28][29][30][31], Pakistan [32][33][34][35][36][37], Romania [38], Slovakia [39], the Asian-Pacific area (including Taiwan, South Korea, China, Hong Kong, India) [40] and European countries (including France, Germany, Italy, the Netherlands and the United Kingdom as one group) [41]. However, these contributions do not focus specifically on knowledge, competences and the competitive advantage of the green-technology companies. Thus, this research on the sample of Polish companies contributes to fill this research gap.
Nevertheless, a large group of countries is not analyzed in this context, even briefly. This conclusion is based on the analysis of publications collected in the Scopus and the Web of Science databases. In the Scopus database, 87 publications were obtained in total, and 34 in the Web of Science, in most cases the same. Each of the publications' contents have been reviewed in terms greentechnology companies and only those that have been flagged are consistent with the topic analyzed in the article. The numbers are small, and no analyses has been carried out for most of the countries. This is the basis for future research-namely, to analyze companies in countries not included in the

Conclusions
The presented research focused on the identification of knowledge and competence sources in Polish green-technology companies, with particular interest in competitive advantage. The ways of gaining and developing identified knowledge and competences were analyzed and the importance of identified knowledge and competences was assessed. Consequently, this paper resulted in the development of the model of acquiring new knowledge by green-technology companies in Poland. This model serves as a basis for gaining distinctive competences by these companies.
The contents of this paper include: the identification of knowledge and competence sources in Polish green-technology companies, a description of the ways of gaining and developing identified knowledge and competences, as well as an assessment of the importance of identified knowledge and competences. These are, on the one hand, practical implications since the present actions or decisions of the analyzed companies that have an impact on green technologies' development and might be useful for both business organizations and wider audiences. On the other hand, these can be seen as scientific implications as well, since they add to the knowledge base related to sustainability and technology development by listing specific sources of knowledge and competences along with their importance.
The limitations of this study mainly regard methodological aspects. The interviewees were companies' managers: owners, board members, and sales directors or product managers in the case of larger companies; therefore, customers' opinions were not collected. Moreover, the researched companies were located countrywide (Poland) with a certain geographical predominance. Finally, analyzed companies represent the most innovative environmental technology suppliers in Poland; thus, activities they perform may not be easily transformed, translated or used by other, less innovative entities in the sector.
The research results allow the identification of future research directions. As it was mentioned at the end of the previous section, one of the potential future studies could conduct similar analyses of companies in countries not listed in a content-based analysis of publications describing operations of green-technology companies. Another idea for future research would be to compare inputs and outputs connected to green-technology companies worldwide. Equity crowdfunding for green technologies development, as the concept for future research, is worth considering as well. The idea of research on the effects of intellectual capital and knowledge sharing impact on the success rate of campaigns of equity crowdfunding for green technology development was inspired by [75]. These topics present promising possibilities for future developments of the described analyses.