Research on the Factors of Competition in the Green Procurement Processes: A Case Study for the Conditions of Romania Using PLS-SEM Methodology

: In this paper, starting from the conceptual model of the rational behavior theory developed by Icek Ajzen, the authors develop a behavioral model of rational expectations of the managerial decisions in order to determine the inﬂuence of the behavior of the undertakings on a competitive environmental market. The data were collected between 1 May 2019–30 June 2019 with the help of a questionnaire addressed to the employees and managers of the companies engaged in the green procurement processes in Romania. The sample volume was 160 and the data was analyzed with partial least square structural equation modeling (PLS-SEM) method and by using the statistical software Smart-PLS 3.2.8. Starting from the relevant economic literature in the ﬁeld of rational behavior, the article identiﬁes the behavioral indicators that underlie the decision to invest in this market. These indicators are the independent variables that model the impact of rational behavioral theory on managerial decisions. The conclusions of the study conﬁrm the theoretical aspects presented in the article, emphasizing that the managerial decisions based on rational behavior theory are the direct result of the cooperation of several factors, such as the strategic vision, innovation, regulation, and the level of competences of the human factor.


Introduction
The threats of the 21st century are perceived, mainly, by the occurrence of climate change, mainly due to the industrial policies applied worldwide. An approach focused on qualitative development, supported by research and innovation projects, in order to improve the quality of environmental factors, commensurate with specific indicators of sustainable development, has a favorable impact, implicitly, on the quality of life, improving environmental conditions and, not last, on the efficiency of resource productivity. If, on an international level, the degree of awareness of environmental hazards could vary from state to state, depending on the accession to the United Nations Convention on Climate Change, within the European Union (EU), awareness of this theory is reflected in policy developments environment, where the recommendations for introducing environmental provisions in the specifications of the public procurement have become obligatory, through the legislative packages adopted by the European forum.
The basic principles of the free movement of goods, services, capital, and persons are laid down in the Treaty on the Functioning of the European Union. These principles have been used in the field of public procurement, in the form of transparency, competition, equal treatment, proportionality, and mutual recognition, as set out in the case law of the Court of Justice of the European Union. From an international perspective, the European "a process whereby public and semi-public authorities meet their needs for goods, services, works and utilities by seeking and choosing outcomes and solutions that have a reduced impact on the environment throughout their whole life-cycle, as compared to conventional products/solutions. A procurement procedure will be considered as 'green' only if it has led to the purchase of a substantively 'greener' product and only if the environmental characteristics of this product go beyond what needs to be complied with on the basis of European or national environmental legislation." [5] International authorities, such as the EU, the UN or EU member states, guide sustainable procurement, addressing the three lines of sustainability [4]. In Romania, for example, "The guide for green public procurement that includes the minimum requirements regarding the environmental protection for certain groups of products and services that are required in the specifications" was approved in October 2018 [8]. The GPP guide contains minimum requirements for environmental protection for priority product groups and/or services: new indoor and outdoor furniture, copy and graphic paper, collection, furniture reconditioning services, and reuse services for the furniture at the end of the lifecycle, transport vehicles, food and catering services, IT equipment and office cleaning products and services.
The aim of this study is to develop a behavioral model of rational expectations in the green procurement market, in order to determine the influence of the behavior of the undertakings on a competitive environmental market. To achieve this goal, a partial least square structural equation modeling (PLS-SEM) method was applied and the statistical software Smart-PLS 3.2.8 was used.
This paper is structured as follows. Firstly, we discuss the impact of green procurement on competition as it was reflected in the economic literature. After that, the research hypotheses are presented and tested. The PLS-SEM model is used to analyze the conceptual structural model based on a survey questionnaire. Discussions, limitations of the study, and further research are summarized in the last chapter of the paper.

Impact of Green Procurement on Competition, Reflected in the Economic Literature and the Hypotheses Development
The economic literature on modeling the ecological procurement processes according to specific variables, such as competition indicators, highlights, above all, the conceptual side of fundamental research [9].
Green procurement is reflected in the literature from the perspective of environmental factors and management strategies for increasing economic performance [10]. The basis of the green acquisitions' decisions can be influenced by the degree of knowledge and awareness of the need to reduce the impact on the environment [11], by the specific regulations and the application by the central or local public authorities [12] as well as the size of companies using resource reintegration programs, resulting from exploitation through innovative processes and technologies [13] without the list of these determinants being exhaustive.
Contracting green procurement within public procurement procedures is possible when evaluating bids takes into account both qualitative factors, such as environmental criteria, and quantitative factors, such as the minimum price criterion. In most cases, however, the contracting authority is tempted to evaluate the offers according to the budgetary constraints, which prevail over the qualitative factors. For these reasons, innovative products that reduce the impact on the environment can be subject to public procurement only when the selection criteria exceed the quantitative considerations.
At the same time, the participation of a large number of bidders in the green procurement procedures has the effect of increasing the competitive pressure and, consequently, the decrease of the price related to the bids submitted by the competitors. Therefore, public entities organizing public procurement procedures should be aware of competition regulations.
Green procurement cannot be an effective tool used in environmental policy, if it does not comply with the competition rules, indicating on the risks associated with direct procurement, participating in the procurement procedures of a limited number of bidders and cooperation within the associations participating in auctions. Although they could be justified in certain situations where the value of the contract would be below the legal thresholds for public procurement or would be exempted according to the national law specific to public procurement, the use of non-competitive procurement procedures, such as direct procurement, should be eliminated in all other situations.
Competition is manifested in conducting the selection procedures for green procurement, respectively within the open tender, the restricted auction, the competitive negotiation, the competitive dialogue and the partnership for innovation. The most indicated procedural forms, which offer the advantage of the flexibility to introduce innovative elements with beneficial effects on the environment, are considered the negotiation and the competitive dialogue [14]. Regardless of the procedural advantages offered, the process of purchasing goods, services or works through any of these procedures allows the participation of several suppliers, on a non-discriminatory basis, in conditions of free competition.
Another important aspect in determining the degree of competition, concerns the particularities of the relevant product market.
Depending on the type of product offered, green procurement may be subject to: • contracts for the acquisition of goods, in which case the selection of offers will take into account the life cycle of the product, respectively the opportunities for reuse of the goods offered, specific to the circular economy and the impact of the re-use process on the environment; • service provision contracts, by contracting the technical expertise in the field of environmental protection, and; • works contracts, which should be based on impact studies on the quality of environmental factors.
Thus, given the particularities of green procurement, the complexity of the selection criteria could act as a restrictive barrier for the potential bidders, competitors on the market, which are able to fulfil the requirements requested in the technical specifications. At the same time, the criterion of transparency can induce predictability in the public procurement procedures, which could lead to an alignment of the offers, by presenting the same detailed elements in the technical specifications. The participation of a large number of bidders in the green procurement selection procedures is beneficial for the contracting entities in terms of a reduced price, better quality, and high degree of innovation. By contrast, participation of a relatively small number of bidders or participating in green procurement procedures in association of companies has the potential to restrict competition, if the participants make agreements on the value of their bids, their volume or on other commercial elements that would could make it predictable to win bids in favor of a participant or an association, as a result of engaging in an anti-competitive practice.
Obviously, when the organizers of the procurement procedures are governmental authorities, poor competition would be equivalent to inefficient use of public funds. In this respect, in full agreement with the European regulations, the CJEU jurisprudence, the national Competition Law [15] and the national jurisprudence, the participation with bids tendered through bidding agreements or practices to manipulate the offered price or value is a form of anticompetitive behavior, which violates the competition rules. The specific characteristics of such collusive behavior can be manifested, in particular, when the market is stable, respectively the products or services offered are homogeneous and there are no major fluctuations of the demand on the market for new ecological, innovative products. Therefore, in the absence of specific contextual situations, the general risk associated with anti-competitive behavior on the Romanian market of green procurement can be relatively reduced, considering that, at this moment, the market of green procurement in Romania is present in a dynamic evolution, less predictive, which does not favor the agreements between the participants, the investments related to innovation playing an essential role [16].
The models of sustainable economic governance follow a reduction of the expenses, due to economies of scale, by accumulating several aspects of economic policy, social responsibility, environmental protection, and competition. Practicing these models of conduct on the market gives credibility to the entities, beneficiaries of green purchases, by the high capacity to respond to the needs of the consumer, continuously and determinedly.
In order to perform an economic modeling of the rational behavior in modeling the impact of green procurement on competition, the following six statistical hypotheses, derived from literature, were formulated: Hypothesis 1 (H 1 ). The strategic vision of the companies involved in the green procurement processes has a positive impact on the competition; Hypothesis 2 (H 2 ). Government regulatory policies regarding green procurement have a strong impact on competition;

Hypothesis 3 (H 3 ).
The level of skills in green procurement has a positive influence on the competition;

Hypothesis 4 (H 4 ).
The integrated operational management of the companies involved in the procurement processes has a positive impact on the competition;

Hypothesis 5 (H 5 ).
The social responsibility of the organizations involved in the green procurement processes has a significant impact on the competition; Hypothesis 6 (H 6 ). The degree of innovation of the companies involved in the green procurement processes is strongly correlated with the degree of competition.

Theory of Rational Behavior in Economic Modeling
The concept of rational behavior was firstly used in the theory of rational choices by neoclassical economists. Thus, the contribution of the scientist William Stanley Jevons [17] on the theory of marginal value, together with similar findings of economists Carl Menger [18] and Léon Walras [19] marked the opening of a new period in the history of economic thought. According to this theory, the process of selection of each individual is determined by the desire to maximize the objective pursued, regardless of the purpose itself.
Advocates of this type of models, such as representatives of the Chicago School of Economics, argue that reality can be modeled by formulating hypotheses that can be verified by empirical testing [20].
The theory of rational choice has acquired new valences in socio-psychology, an example being conferred by the theory of rational behavior, developed by Icek Ajzen in 1967 (see Figure 1). Individual decisions, extended at the organizational level, assume a certain behavior, which is based on the expected results.
Modeling the economic process, in this context, can introduce specific indicators of sustainable development, in order to maximize them. The decision to invest in ecological projects can be validated by economic modeling based on a set of hypotheses, which will be presented below. Modeling the economic process, in this context, can introduce specific indicators of sustainable development, in order to maximize them. The decision to invest in ecological projects can be validated by economic modeling based on a set of hypotheses, which will be presented below.

Research Methodology
The objective of this paper is to validate the conceptual model by quantitative econometric analysis of the data collected from the companies involved in green procurement in Romania. The study also analyzes the impact of the quantitative model, represented by the strategic vision, regulation and the level of competences, the integrated operational management, the social responsibility, and the degree of innovation on the competition.
The data was collected with the help of a questionnaire which was addressed to the managers and employees of the companies that invested in green projects. The companies were selected proportionally to their size. According to [22], the sample volume was calculated by multiplying the number of indicators by a value between 5 and 10. Thus, the sample should be at least 23 (indicators, see Table 1) × 5 = 115 respondents. Thus, data was collected from 150 questionnaires out of which 140 were valid. The answer variants for the questions in the questionnaire were either binary (No = 0, Yes = 1), or using a sevenpoint Likert scale, where the answer variants ranged from "very little = 1" to "very much = 7 ". The questionnaire has been pre-tested to ensure that the format, language, and order of the questions are appropriate. Existence of a management strategy oriented to reintegration programs of the resources used in the production circuit Participation in the green procurement procedures organized by the public authorities Reglementation (Reglem) Reglem_ Funding programs from European and/or national public funds

Research Methodology
The objective of this paper is to validate the conceptual model by quantitative econometric analysis of the data collected from the companies involved in green procurement in Romania. The study also analyzes the impact of the quantitative model, represented by the strategic vision, regulation and the level of competences, the integrated operational management, the social responsibility, and the degree of innovation on the competition.
The data was collected with the help of a questionnaire which was addressed to the managers and employees of the companies that invested in green projects. The companies were selected proportionally to their size. According to [22], the sample volume was calculated by multiplying the number of indicators by a value between 5 and 10. Thus, the sample should be at least 23 (indicators, see Table 1) × 5 = 115 respondents. Thus, data was collected from 150 questionnaires out of which 140 were valid. The answer variants for the questions in the questionnaire were either binary (No = 0, Yes = 1), or using a seven-point Likert scale, where the answer variants ranged from "very little = 1" to "very much = 7 ". The questionnaire has been pre-tested to ensure that the format, language, and order of the questions are appropriate.
In the past decades, for the complex analysis between the latent and observed variables covariance-based structural equation modeling (CB-SEM) method was used. Moreover, by 2010 more scientific papers used CB-SEM instead of PLS-SEM in their analysis. In the past few years, the number of published papers using CB-SEM was overpassed by the number of papers using PLS-SEM [23]. In fact, PLS-SEM is now used in many research papers in statistics, including statistical distributions [24], biostatistics [25], financial statistics and econometrics [26], sample surveys [27], machine learning [28], and time series analysis [29]. Several edited volumes [30,31], textbooks [32,33], and scholarly journals [34,35] illustrate PLS-SEM methodology or purpose extensions of it.
The PLS-SEM method is widely used to research papers which re estimating complex models with several constructs, structural paths and indicator variables without imposing assumptions on the distribution of the data. Moreover, PLS-SEM is an approach of SEM based on causal-prediction estimations of the statistical models [36,37]. Other authors [38][39][40] provide detailed discussions and arguments related to why and when to use PLS-SEM methodology.
The PLS-SEM method was used by many researchers to estimate composite models with several constructs, structural paths, and indicator variables without imposing assumptions on the distribution of the data. Moreover, PLS-SEM is a causal-predictive approach to SEM that underlines prediction in estimating econometric models, whose structures are made to provide causal explanations [41,42]. Hence, the technique overcomes the possible dichotomy between prediction and explanation, which is the foundation for building managerial implications [43]. Consequently, user-friendly statistical software is available that usually require little technical knowledge about the method, such as SmartPLS and PLS-Graph [44,45]. Other authors [46,47] provide more detailed discussions and arguments on when to use and not to use PLS-SEM. The authors conclude that the best situations when to use PLS-SEM are when the path model includes one or more formatively measured constructs, when a small population restricts the sample size, when the structural model is complex and includes many constructs, when the research is based on secondary data, and finally, when distribution of the data has normality issues. Existence of priority environmental objectives, made aware at the organization level (on a top-down scale), through programs to streamline the use of resources vs_2 The existence of a cooperation partnership in the field of sustainable economy with organizations in the public and/or private environment (chambers of commerce, entrepreneurs' associations, universities, central or local public authorities, etc.) vs_3 Existence of a management strategy oriented to reintegration programs of the resources used in the production circuit vs_4 Participation in the green procurement procedures organized by the public authorities

Reglem_1
Funding programs from European and/or national public funds Reglem_2 Economic incentives provided for in national legislation, favorable to investments in "green" projects Reglem_3 Existence of a legal framework adopted in the field of green procurement

Compet_1
Participation in discussion forums and information exchanges with profile organizations, to transfer knowledge of developments and expertise in the field of green procurement

Compet_2
Training courses for specialists in the field of environmental policy and public procurement, especially in the field of green procurement

Compet_3
Knowledge of specific and/or functional criteria in the field of green procurement that ensures compliance with the legislation in the field Compet_4 Innovative technologies research to reduce energy consumption, extend product life, and reuse resources

Oper_1
Existence of a procurement and strategy department to respond adequately to external requests (business partners, public authorities, etc.)

Oper_2
Existence of a logistics department, responsible for packing, recycling, resource reuse, low energy consumption, etc.

Oper_3
The existence of an applied research department, which integrates innovative products and/or technologies in the production circuit Oper_4 The existence of an integrated data flow, available to the directorates within the organization

Resp_1
Carrying out campaigns of social involvement, by presenting the benefits of green acquisitions Resp_2 CSR and ethics programs at the organization level Resp_3 Incentives provided to employees for compliance

Inov_1
Holding certifications in the field of organic production (for example, the use of eco-label labels) Inov_2 Holding patents/licenses for environmentally friendly technologies The main advantage of using PLS-SEM is the relaxation of the normal distribution assumptions required for the maximum likelihood method used in estimating models using CB-SEM, and the ability of PLS-SEM to easily estimate more complicated models based on a small sample sizes [48]. When models comprise many items and a large number of constructs, PLS-SEM has solutions for small sample sizes. recent papers [38,49] explain how PLS-SEM provides solutions when other methods, such as CB-SEM do not converge with small sample sizes and complex models. Moreover, many recent studies indicate that the main reason for choosing PLS-SEM methodology is the lack of distributional assumption need [50][51][52].
Given all the above reasoning, we could conclude that PLS-SEM is quite suitable for this research topic, including when the research goal is exploratory research for theoretical development; when the analysis is from a predictive perspective; when the structural model is complex; when the distribution lacks normality; when the study requires a latent variable score for subsequent analysis.
To analyze the impact of green acquisitions on competition, a quantitative analysis based on a survey was carried out, using a questionnaire. The statistical assumptions described above were tested using the partial least square structural equation modeling (PLS-SEM) model, and the data was analyzed using the SmartPLS 3.2.8 statistical software [53]. The main purpose of the quantitative analysis was to study the impact of green procurement on the competition of companies that have invested in green projects.
The model, consisting of the dependent variable and the independent variables described above, leads to the formation of the model (Figure 2). It will be tested and then validated in the next chapter.
ing CB-SEM, and the ability of PLS-SEM to easily estimate more complicated models based on a small sample sizes [48]. When models comprise many items and a large number of constructs, PLS-SEM has solutions for small sample sizes. recent papers [38,49] explain how PLS-SEM provides solutions when other methods, such as CB-SEM do not converge with small sample sizes and complex models. Moreover, many recent studies indicate that the main reason for choosing PLS-SEM methodology is the lack of distributional assumption need [50][51][52].
Given all the above reasoning, we could conclude that PLS-SEM is quite suitable for this research topic, including when the research goal is exploratory research for theoretical development; when the analysis is from a predictive perspective; when the structural model is complex; when the distribution lacks normality; when the study requires a latent variable score for subsequent analysis.
To analyze the impact of green acquisitions on competition, a quantitative analysis based on a survey was carried out, using a questionnaire. The statistical assumptions described above were tested using the partial least square structural equation modeling (PLS-SEM) model, and the data was analyzed using the SmartPLS 3.2.8 statistical software [53]. The main purpose of the quantitative analysis was to study the impact of green procurement on the competition of companies that have invested in green projects.
The model, consisting of the dependent variable and the independent variables described above, leads to the formation of the model (Figure 2). It will be tested and then validated in the next chapter.

Model Estimation and Results
Starting from the conceptualized model of rational behavior theory described in the previous chapter, the following six proxy variables were considered success factors regarding the implementation of the model (Table 1): the strategic vision of the companies involved in ecological projects [54], the degree of regulation on green procurement [55], the level of competences [56], the integrated operational management [57], social responsibility [58], and the degree of innovation in the organic production process [59].
The independent variables described in Table 1 will be the latent variables of the model, while the reflexive dependent variable is "the degree of competition". This is described in Table 2 and is determined by three proxy variables: "The number of competitors on the green procurement market", "the price offered for the green procurement versus the reference price on the market", and "the degree of concentration on the green procurement market" [60].

Conc_1
Number of competitors in the green procurement market Conc_2 The price offered for green purchases versus the reference price on the market Conc_3 The degree of concentration on the green procurement market The questionnaires based on which the quantitative analysis was carried out, were addressed to both the management of the companies that built ecological projects, following the participation in the public procurement procedures, starting with the beginning of May 2019 and completed at the end of June of this year. The distribution of the respondents in the sample, depending on the function they hold within the selected company, is the following: Staff (22), Management (118), and Total (140). As it could be seen from the table above, the sample consisted of 140 managers and executives from companies that are involved in environmental projects won through public procurement procedures, which have been interviewed directly, the questionnaire containing 30 questions.
For the data collection, the simple random sampling method was used, between 1 May 2019-30 June 2019, using a questionnaire with both closed and open questions. The main problem in collecting the data was the reluctance of the respondents to complete the questionnaires. The main objectives pursued in carrying out the study were: determining the degree of regulation in the field of green procurement; identification of respondents' level of knowledge regarding green procurement, based on age, gender, educational level, and respondents' interests; evaluating the competences of the employees and evaluating the strategic vision, social responsibility, integrated operational management and the degree of innovation in the organic production process.
Before starting the actual analysis of the model, the degree of significance of the variables of the conceptual model will be tested. For this, the Cronbach's Alpha and Dillon-Golsteins' coefficients will be calculated and interpreted [61]. Table 3 shows the values of these indicators. From Table 4 it can be observed that the VIF (variance inflection factor) values of the latent variables are lower than 5. According to [62], it results that there are no problems of collinearity between the independent variables in the model. It can also be observed that the values of the Cronbach's Alpha and Dillon-Golsteins' coefficients of the six independent variables have values greater than 0.7. Thus, we can conclude that the independent variables in the model are significant.
The econometric analysis was performed using the PLS-SEM method. It consists of the analysis of two sub-models, respectively the measurement model "outer model" and the structural model "inner model". The PLS-SEM method was chosen for data analysis in the detriment of other similar methods, such as covariance-based structural equation modeling (CB-SEM), because it is less sensitive to asymmetric distributions, small samples, or the presence of multicollinearity, but, at the same time, it is even more robust [63,64]. Nacaskul [65] states that construct validity must be examined when a latent variable explains a statistically significant part of the variation of its constructs. In Figure 3, we can observe the coefficients related to the variables in the measurement model, obtained using the SEM-PLS equations. Chin [66] considers that the constructs for which the coefficient values are less than 0.5 should be excluded from the measurement model. As a consequence, from the model we will exclude the variables: vs_4, compet_2, oper_3, and resp_3. After these variables were removed from the model, using the SEM-PLS equations and using the SmartPLS 3.2.8 software, we obtained the second measurement model.
As it can be seen in the Figure 4, the values of all the coefficients of the reflective variables in the model are greater than 0.5, from which it follows that all these coefficients are valid. Thus, the construct validity of the model is confirmed. Chin [66] considers that the constructs for which the coefficient values are less than 0.5 should be excluded from the measurement model. As a consequence, from the model we will exclude the variables: vs_4, compet_2, oper_3, and resp_3. After these variables were removed from the model, using the SEM-PLS equations and using the SmartPLS 3.2.8 software, we obtained the second measurement model.
As it can be seen in the Figure 4, the values of all the coefficients of the reflective variables in the model are greater than 0.5, from which it follows that all these coefficients are valid. Thus, the construct validity of the model is confirmed.

Divergent Validity
The divergent validity can be tested using the average variance extracted (AVE) indicator. Fornell and Larker [67] state that if the square root of the correlation coefficient values between the latent variables is smaller than the values of the AVE indicators related to the latent variables, then the discriminant validity is confirmed. In Table 4, these values can be observed.
As we could see in the Table 4, the square roots of the correlation coefficients are lower than the AVE indicator values for all latent variables, which confirms the discriminant validity of the measurement model.

Structural Model
The 'inner model' structural model was described in Figure 2. This indicates the connection between the exogenous variables in the model and the endogenous variable. The structural model [59] is described by the equation where: δ-the vector for the endogenous latent variables; φ-the vector for the exogenous latent variables; Σ-the residual variable vector; Λ and Γ-matrices of the path coefficients.

Results and Discussions
The values of the coefficients of the structural model are estimated using the structural equations, and the values obtained could be seen in Figure 4. The value of R-square is 0.668, which means that 66.8% of the variability of the competition degree regarding the green acquisitions is explained by the variability of the model. Regarding the estimated values of the coefficients of the structural model, we observe that all are positive, which means that all latent variables have a positive impact on competition. Thus, of the six indicators, the variable with the greatest impact on competition is "regulation" (factor 0.712), followed by "strategic vision" (factor 0.658), "degree of innovation" (factor 0.622), operational management "(factor 0.608), "competencies" (factor 0.584), and "responsibility" (factor 0.379). The reflective indicators of the dependent variable "competition" have values greater than 0.5, which means that the variables (conc_1, conc_2, and conc_3) are statistically significant. The high values of the reflective variables, namely "number of competitors on the green procurement market", "price offered for green purchases versus reference price on the market", and "degree of concentration on the green procurement market" show us that the degree of competition is well represented by the three indicators. In general, multiple factors improve the performance of the model and increase reliability compared to single factors. In our model, the dependent variable is composed of three variables. As with the formative variables, a reflective variable has a greater impact if it has high values of the coefficients, reflecting stronger ways of measurement. This is confirmed by the high values of the three coefficients of the dependent variables.
In addition, to test the six statistical assumptions described in the previous chapter, a Bootstrap Test was performed on a sample of 300 respondents to generate the values of the t test (t-test) and the mean square deviations (standard deviation) of the model parameters. According to statistical theory, 'bootstrapping' allows the allocation of precision measurements to sample estimates. The results regarding the testing of statistical assumptions can be seen in Table 5. At a significance level of 95%, the assumptions for which the p-value is less than 0.05 are validated, while the others for which the p-value is greater than 0.05 are not. Thus, we can conclude that Hypotheses H 1 , H 2 , H 3 , H 4 , and H 6 are valid, while H 5 is not. These results confirm the economic studies according to which the strategic vision, the degree of regulation, the level of competences, the integrated operational management, and the degree of innovation have a significant impact on the competition in the green procurement [68] but denies that corporate social responsibility is an important factor in the degree of competition in green procurement [69,70]. This leads to the conclusion that CSR is not well developed in Romania and a possible explanation for that is that the companies do not get enough incentives from the government for implementing CSR's in green procurement.
In conclusion, we can affirm that the strategic vision, the degree of regulation, the level of competences, the integrated operational management, the social responsibility of the companies and the degree of innovation are determining factors regarding the degree of competition in the green acquisitions in Romania.

Conclusions
Using economic modeling in rational behavior theory to model the impact of green procurement on competition using SEM-PLS structural equations, the article estimates and then evaluates the correlation between the determinants of the conceptual management model in analyzing the impact of green procurement on competition. The results indicate that a significant proportion of the variability of the dependent variables is explained by the independent latent variables. Thus, regulation is one of the main criteria that influence the degree of competition in the market of green procurement. Also, two other important factors that converge towards a high level of competition refer to the strategic vision of the companies and the degree of innovation incorporated in the products or technology offered by these companies, which participate in the public procurement procedures. The evaluation results also take into account other criteria, such as the level of knowledge and skills available to market participants, the operational level, and social responsibility. At the same time, we notice the significant contributions of the decision-making processes carried out at the management level, which lead to the increase of the staff motivation, developing the organizational culture and, last but not least, the competitiveness of these companies, reflected by better quality and accessible prices to the offered products. This assessment is based on the high value of the coefficients corresponding to the processes at the management level, quantified in the model.
The survey used in this study highlights the fact that the integrated operational processes used by a company involved in green procurement have a positive impact on the degree of competition and sustainable development. From the analysis of the model, it is highlighted that the confidence of entrepreneurship in government policies for the development of the bioeconomy is very low. We also note that the principle of CSR is an abstract concept, without real applicability, as the modest results obtained for the corporate social responsibility indicator suggest.
The results of the behavioral model, analyzed with the structural equations modeling, confirm the studies in the literature, emphasizing that strategic vision, the degree of regulation, the level of competences, the integrated operational management, the social responsibility of the companies, and the degree of innovation are determining factors in terms of the degree of competition in green procurement in Romania.
This paper confirms the importance of the green procurement in Romania, for the reasons underlined in his paper, in line with our wide review of the literature in the field. Incidentally, a narrow institutional framework was adopted at the EU level, containing rules meant to bring significant development to the plan which was mentioned above, which was mostly transposed by all EU Member States. However, according to the reports of the relevant institutions, the margins of expectation regarding the actual achievements are still high. Moreover, when discussing the problems related to the implementation and elaboration of national legal instruments introduced to stimulate GPP, a whole series of critical issues is coming up. To conclude, these instruments have not demonstrated their efficiency to stimulate GPP.
A limitation of this study is given by the relatively small number of survey respondents. Another limitation of this research is related to the possible subjective answers of the respondents of the questionnaire and to the relatively small number reflective variables and constructs. In future research, these limitations could be overwhelmed by increasing the number of reflective variables, the constructs, and the sample size, as well as by introducing open-end questions into the questionnaire. Further studies in the field of rational behavior theory in modeling the impact of green procurement on competition should be extended to other industries or sectors, and the research may include some possible macroeconomic effects.