The Study of Events Approach Applied to the Impact of Mergers and Acquisitions on the Performance of Consulting Engineering Companies

: Recent research suggests that one of the main motivations for mergers and acquisitions is the attempt to acquire companies to incorporate intangible assets. Such assets provide important sources of sustainable competitive advantages and opportunities for growth. This article analyzes the strategies of engineering companies, as well as value creation in acquisition events of multinational companies, by using the study of the events method, providing an innovative way to be applied to this phenomenon. This method is used in our research to study the inﬂuence of the announcement of acquisitions on the abnormal accumulated returns of the acquiring companies, and is allowed to conﬁrm that inﬂuence. In general, the average accumulated returns were positive and statistically signiﬁcant in the three windows of the method, according to the signiﬁcance tests used. The results validate the hypothesis that the events generate synergy gains for market players, emphasizing the importance of growth via acquisitions for the sector under analysis.


Introduction
Contemporary literature suggests that investment decisions are made based on several different reasons. One of the main reasons is the prospect of business growth. If a company decides to expand or diversify, there are two possible paths: internal growth or mergers and acquisitions (M&A). According to Singh and Montgomery [1], the process of internal growth takes more time and can be more costly than buying an already established business. Several different advantages can be attributed to growth through mergers and acquisitions. Regardless of the form chosen, the objectives of this growth process must be related to shareholder value creation, by increasing the company's competitiveness.
Concerning the increasing competitiveness and synergy gains, it is very common to deal with intangible assets. After all, these assets provide their owners with important sources of differentiation and, therefore, a sustainable competitive advantage. Considering that, there are indications that incorporating companies is currently one of the main motivations for carrying out mergers and acquisitions.
Accordingly, it seems relevant to try to answer the following research problem: what is the relationship between the acquisition of companies and the creation of value and synergy gains for the acquiring company in a merger and acquisition's event? In our paper, we answer this question by applying a model, innovative on its purposes of getting results for this research problem. economic growth, including capital markets and increased international competition. For Weston et al. ( [6], p. 194), the following wave comprised the 1990s. The economic recovery brought a new movement of acquisitions. In this period, the main motivations were technological changes (fiber optic and microwave communication and a significant increase in internet use), growth in global competition, deregulation of several markets, and macroeconomic and microeconomic changes. Gaughan [7] says that this new wave of mergers and acquisitions is motivated much more by strategic issues than by rapid financial gains. In addition, in contrast to the previous wave, most acquisitions are carried out with the use of equity capital. This was a strategy of consulting engineering companies.
The main reasons that lead companies to adopt a strategy of mergers and acquisitions are based on the firm's theory. For Coase [8], the emergence of firms in an economy regulated by price mechanisms is related to maximizing the allocation of resources directly by the entrepreneur in a less costly way than in the market. Based on these premises, the size of companies would be limited, by not only transaction costs, but also administrative costs and the ability to manage the company. It becomes cheaper to acquire a product or service in the market than to invest to produce it.
In this article, when we analyze mergers and acquisitions within an event study approach, we have two main goals: Moeller et al. [6,[10][11][12], we use SCM as a powerful alternative approach to the return market model MacKinlay [11]. Billmeier and Nannicini [13] highlight the transparent measurement of the counterfactual outcome of the treated unit as a great advantage of this method. To the best of our knowledge, Castro-Iragorri [14] was the first to address SCM on event studies literature. Within the SCM, we explore whether the M&A in time (T) leads to higher-growth on the stock return in the event window (T − i; T + i), compared to similar stocks that did not made M&A. Our evidence finds similar impacts of the M&A strategies in both methods, highlighting the value of SCM as an instrument tool on M&A analysis. Second, our results show that acquires perform strong abnormal return in the M&A event window. This analysis is important toward understanding the role played by M&A in market value creation to firms. Moreover, we use a firm-level analysis; the focus on the biggest companies minimizes the bias of heterogeneity in the sample of events. The empirical results also reveal that the abnormal market return observed is at the upper limit established by the literature (Weston, Siu and Johnson, 2001) [6]. We believe that this evidence is related to the firm characteristics of acquires, which have a high degree of intangibility, intensive spends of R&D, and cross-border activities. All of them are important issues to determine the level of abnormal returns in M&A (Wilcox et al.; Bednarczyk et al. [3,15]. In order to evaluate the hypothesis of synergy gains, resulting from changes in the corporate structure of companies, Mulherin and Brooke [16] modeled acquisitions and diversity decisions based on the theory of events approach. Based on a sample of 1305 U.S. companies listed on Value Line's Power Industry throughout the 1990s, and after initial cutoffs, 281 acquisition events and 268 divestiture episodes were modeled, based on daily return data from the listed companies. Gains in market value were evidenced after the announcement of both acquisitions and divestitures, indicating that the processes show optimal responses to changes in economic conditions linked to productive specialization (cost structure and synergy gains). The analysis of event studies is used in Harris [17], to discuss the importance of crossborder acquisitions over foreign direct investment in the US. Several transmission channels are scored as value drivers for both acquirer and acquired firms in international transactions. These include reduction in transaction costs through the market mechanism, greater access to technology transfer, minimization of tariff costs associated with international business (complexity in regulatory policy in different countries), and imperfections in the capital market associated with exchange rate fluctuations (an exchange rate valorization in the currency of the acquiring company increases its bargaining power). The sample included companies acquired between 1970 and 1987, and were listed on the NYSE, considering 1114 domestic M&A and 159 cross-border acquisitions (company headquartered acquired outside the U.S.). The results indicated abnormal market gains for the target companies in cross-border acquisition events. The authors score additional gains in transactions involving R&D intensive firms, suggesting that technology transmission is a crucial factor for the M&A decision in international negotiations.
The technology diffusion element from cross-border acquisitions is also discussed in Bednarczyk et al. [3], from the energy and industry sectors in Central and Eastern Europe (CEE). The cross-border horizontal acquisitions (industry relatedness) reach higher wealth effects for both acquirers and targets firms. The results would be related to synergy gains by increasing efficiency and transfer technology.
In this context, we follow Gopalaswamy et al. [18], modeling the announcement of a merger and or acquisition as the event of analysis, taking the stock price as a regressor to be estimated in the econometric structure. Strong [19] highlights variations greater than a certain expected limit as the abnormal market return, being the same identified within the window of the event.
Sectorial specific analyses are also widely disseminated in the literature. The banking industry, for example, is a recurring theme in the analysis of the study of events. The popularity of this theme was mainly a result of the trend of creating financial conglomerates from the 1980s, in a number of countries, under the justification of reducing service costs and increasing operational flexibility based on economies of scale. Hannan and Wolken [10] conducted a pioneering study of 69 M&A episodes involving U.S.-listed companies, based on the market model, applying an estimation window in the interval between 90 and 16 days before the event announcement. The evidence points to a combined zero net effect to acquiring and acquired firms; the result of an abnormal positive return for shareholders of target banks, and negative for shareholders of bidder banks. Liargovas and Street [20] studied M&A events in the banking sector between 1996 and 2009 for institutions listed on the Athens Stock Exchange (Greece). The authors do not observe cumulative mean abnormal returns for both bidders and target firms. One of the key factors related to the result is the lack of improvement in operational performance as a result of M&As.
Wilcox et al. [15] find evidence that M&A is an important growth strategy (market value) in the U.S. telecommunications industry, being the size of the company and the similarity in activities between the companies involved in the business catalyst-the process of market valuation. The authors attribute the effect to the lower risk involved for these M&A configurations, market consolidation (size), and already recognized expertise in the activity (know-how).
Khanal et al. [21] investigate the effect of M&A on the ethanol-based biofuel industries. The study starts from the hypothesis that M&E processes generate vertical integration (operational costs reduction), market-share gains, and enable the adoption of new technologies (productive specialization) for companies in the sector. Based on the market-adjusted equally weighted index and market-adjusted value-weighted index, the authors report gains in market value from M&A events for companies listed in the United States between 2010 and 2012.
In Table 1, we summarize some major contributions that used the events approach on this topic. The paper is organized into the following sections: Section 2 presents the methodology for event studies. In Section 3, we present two approaches to the events study model: the market model approach and the synthetic control approach performance. In Section 4, we present an application of the model and the results and the discussion. Finally, Section 5 presents a discussion and our conclusions.

Methodology
The methodology of the study of events has been widely disseminated and used in the areas of economics, accounting, and finance. Among the events studied and their implications, we highlight the following two topics, among others: dividend announcements, and mergers and acquisitions. According to MacKinlay [11], the methodology of the study of events is pretty old, and has, over the years, been sophisticated. Moreover, according to MacKinlay [11], the research of Ball and Brown [22] and Fama et al. [23] introduced the methodology that is essentially used today. Brown and Warner [24,25], in their articles from 1980 and 1985, sought, from monthly and daily data of the stock prices of companies, to test the efficiency of several methodologies that were used to measure the performance of the prices of bonds. According to these authors, monthly data offer some advantages over the daily data.
The study of events is a widely used approach to capture market reaction from M&A processes based on stock prices listed on stock exchanges ( Figure 1). The model starts from the assumption that the whole set of relevant information is quickly incorporated into the stock price (market efficiency). In this line, variations in the market return of the companies in the short term, soon after the edition of the event, are considered a proxy for the estimation of the gains of synergy and economies of scale, resulting from the productive restructuring of companies through inorganic growth. of the stock market operations, or in the neighboring of non-busine and/or weekends). Keeping in mind that the market may captur mation before the relevant fact is announced, it is necessary to isol window, purging such noises from the estimation of pre-announce (iii) Specifying the selection criteria of relevant facts: it is necessary to to evaluate only those mergers and acquisitions that were in fact im terms for the companies. Such criterion can be summarized by a set (representativeness in terms of market share of the acquired com value of the negotiation, ratio between the size of the target compan ing company, selection of incorporated companies that were listed change, etc.).
Thus, the step to measure the abnormal market returns (measure gains) consists in estimating the market returns of market players (incor nies) in the pre-event period ∈ ( 0 + 1, 1 ) (estimation window) and sitivity parameters in relation to the control variables.

Hypothesis 1. Merger and acquisitions have a positive growth effect in cons companies.
The event study can be considered a methodology with very wellerties to identify the effect of the M&A announcement on the market va holders of the companies involved in a short-term horizon. From a practi the empirical methodology was formally elaborated by Fama et al. [23], ments later carried out with a view to overlapping violations of statistical summarized by Mackinlay [11]. The basic hypothesis of the event studie markets operate efficiently, so that the price of assets fully reflects the in bility in the market (Fama [26]).
Concerning the information absorption time, the efficient marke three distinct forms: (i) weak form: where all the information contained incorporated to current prices; (ii) semi-strong form: where the asset pric of the public information available to the general public; (iii) strong form prices incorporate all of the information available to at least one investo In other words, the efficiency of the markets in any version implie ment of the prices of the assets, in front of new, available information affects the value of the company, being the analysis of short term ideal ment of the gains of the market, resulting from changes in the foundatio nies.
The conclusion of an M&A transaction is a relevant event that impac structure of the related companies. To this extent, M&A events containi the companies listed on the stock exchange must be published for the pu Pos-Event windows ∈ [ 2+1, ∞) In general, the methodology of the study of events involves the following: (i) Specifying the date of occurrence and the relevant fact: in this study, the event will be the exact date τ 0 on which the conclusion of the merger and acquisition deal is formally announced. (ii) Specifying the pre-event and event windows: Mackinlay [11] points out that it is standard in the analysis to build a more extensive event window than just the date τ 0 , considering that the announcements may have been made after the closing time of the stock market operations, or in the neighboring of non-business days (holidays and/or weekends). Keeping in mind that the market may capture relevant information before the relevant fact is announced, it is necessary to isolate the pre-event window, purging such noises from the estimation of pre-announcement returns. (iii) Specifying the selection criteria of relevant facts: it is necessary to define a criterion to evaluate only those mergers and acquisitions that were in fact important in market terms for the companies. Such criterion can be summarized by a set of characteristics (representativeness in terms of market share of the acquired company, monetary value of the negotiation, ratio between the size of the target company, and the acquiring company, selection of incorporated companies that were listed on the stock exchange, etc.).
Thus, the step to measure the abnormal market returns (measurement of synergy gains) consists in estimating the market returns of market players (incorporating companies) in the pre-event period τ ∈ (T 0 + 1, T 1 ) (estimation window) and obtaining its sensitivity parameters in relation to the control variables. The event study can be considered a methodology with very well-established properties to identify the effect of the M&A announcement on the market value for the shareholders of the companies involved in a short-term horizon. From a practical point of view, the empirical methodology was formally elaborated by Fama et al. [23], while the refinements later carried out with a view to overlapping violations of statistical hypotheses were summarized by Mackinlay [11]. The basic hypothesis of the event studies approach is that markets operate efficiently, so that the price of assets fully reflects the information availability in the market (Fama [26]).
Concerning the information absorption time, the efficient market hypothesis has three distinct forms: (i) weak form: where all the information contained in past prices is incorporated to current prices; (ii) semi-strong form: where the asset prices incorporate all of the public information available to the general public; (iii) strong form: where the asset prices incorporate all of the information available to at least one investor.
In other words, the efficiency of the markets in any version implies the fast adjustment of the prices of the assets, in front of new, available information that potentially affects the value of the company, being the analysis of short term ideal for the measurement of the gains of the market, resulting from changes in the foundations of the companies.
The conclusion of an M&A transaction is a relevant event that impacts the productive structure of the related companies. To this extent, M&A events containing at least one of the companies listed on the stock exchange must be published for the public. The analysis of this event is theoretically based on the premise of market efficiency in a semi-strong form, a condition under which the event study approach allows for strong inference of the parameters of interest and gains in market value arising from possible synergies in the corporate restructuring process.
The focus of the approach is to measure the cumulative mean abnormal returns in a window around the analyzed event, inferring the potential effect generated by an announcement (Kothari and Warner [27]). Most studies adopt daily data for a more accurate and informative measurement of the impact of the event, being the traditional method for measuring cumulative mean abnormal returns part of a market return model (MacKinlay [11]), estimated in a pre-event window.
Mandelker [28] conducts a pioneering study in the impact analysis of M&A processes from the measurement of cumulative mean abnormal returns. This author used monthly data from all common stocks traded on the New York Stock Exchange (NYSE) between   [14], where the synthetic control method is used (Abadie et al. [9]) to adjust the market model in obtaining a synthetic portfolio. The author makes a comparison with the traditional market approach, observing a good adjustment of the market return model, both in the context of a diversified market index (S&P 500) and in the context of smaller markets (Colombia Index). However, the adoption of the synthetic control approach can be considered as a good robustness exercise for the results observed via the market model, an option that will be adopted in this article.

Market Model Approach
The market model was formally elaborated by Fama et al. [23], with important refinements being enhanced by Mackinlay [11]. Assume that the return on company i for the period t is estimated by the market model proposed by Mackinlay: where r it = p it p it−1 − 1 is the return observed for the incorporating firm i in period t, and r mt the return of the market index m in period t, β i are the estimated sensitivity parameters, being p it the price share of the incorporating firm i in period t and t a non-correlated error term, with expected value zero and constant variance matrix.
After obtaining the sensitivity parameters in the estimation window, it is necessary to calculate the difference in returns for the incorporating company in the window of events, comparing the market returns (r t ) observed in the interval immediately before and after the event (three windows will be adopted), considering 2, 5, and 10 days before and after the event, respectively) to the counterfactual returns (r t =β 1 +β 2 r mt ), measured from the interaction between the estimated parameters in the estimation window and the market return r mt observed along the window. Thus, the abnormal returns are given by: Moreover, the accumulated abnormal returns along the window of events are given by: Thus, the global inference test is based on the cumulative average abnormal returns (CAAR) containing all events in the sample. In formal terms, consider the existence of n = 1, 2, .. , N M&A events, then the CAAR is obtained as: The estimated values for the CAAR passed a significance test in order to test the null hypothesis of the null estimated effect of M&A events on the companies' market value. In case of rejection, then it is possible to infer the magnitude of the impact of the acquisitions on the average market value of the five largest consulting engineering companies.

Synthetic Control Approach
The central objective of the event study approach in our specific problem is to project the evolution of market returns of the companies involved in the business under the hypothesis of the non-existence of the M&A event. To achieve the predetermined objective, it is necessary to estimate the potential results of the companies mentioned along the event window from an appropriate counterfactual.
The market model adopts the temporal behavior of market indices as counterfactual for predicting the normal return associated with companies during the window of events. However, other models were also adopted by the literature in order to allow the comparison of results obtained with those observed by the market model, providing greater robustness in the analysis of the estimated effects. In this case, an alternative proposed by Castro-Iragorri [14] consists of adopting the synthetic control model proposed by Abadie et al. [9].
The method aimed to build the trajectory of the variable of interest (the market return of the companies in the window of events) in case the treatment (M&A event) did not occur. This counterfactual trajectory was obtained from a weighted average based on units of control (other companies that are listed in the same index as the acquiring company) that, theoretically, did not receive the treatment (did not perform M&A in the same period) and were not directly or indirectly affected by the event of interest.
In this context, our goal is to use a portfolio of companies in the control group to model the counterfactual trajectory of the company being treated (acquiring company) and estimate its normal returns during the event window. According to Castro-Iragorri [14], the synthetic portfolio results in a customized market index to project the market returns of the firms affected by the event. The participation of each company in the control group in the customized market index is obtained from the definition of relative weights that minimize the distance between the path of the observed variable of interest and its counterfactual trajectory.
Where r i,t is the return of the share of the acquiring company, and r j,t = r 2,t , .., r j,t the vector with J shares of companies contained in the control group, the construction of the synthetic portfolio is obtained by solving the following optimization problem: where t ∈ (T 0 , T 1 ) denotes the estimation window, w j (where w j ≥ 0 ∀ j = 2, ..J e J ∑ j=2 w j = 1 ) the relative weight assigned to control unit j in the construction of the synthetic portfolio. Assume that w j = w ∀ t, i.e., the relative weights are constant over time. Note that the impact of the treatment estimated by the synthetic control model is equivalent to the abnormal returns obtained by the market model: where t ∈ [T 2 , T 3 ] denotes the window of the event, and w * j the relative weights that minimize the Equation (5)-for more details on the optimization process see Abadie et al. (2010) [9]. Thus, the synthetic control approach provides an alternative representation for abnormal market returns, obtained from a conditioned optimization on a set of shares listed in the local market of the analyzed company. The great theoretical advantage associated with this approach is that the relative weights for the construction of the counterfactual return are obtained by the similarity in the variations of the return of the shares in the control group, in relation to the fluctuations in the return of the company's shares treated in the pre-treatment period (estimation window), and not by the market capitalization (main metric used to define the relative weights of the companies in a market index, such as the S&P 500), making obtaining of the potential results theoretically more efficient.
The transformation of abnormal returns into average accumulated returns (CAAR) and the hypotheses tests for significance adopted are the same discussed for the market model (Equations (3) and (4)).

Empirical Analysis
In this topic, we consider the impact of M&A on the market value of the acquiring companies. The market model and synthetic control model will be used to measure the abnormal returns from the date of the conclusion of the deal.

Sample
The sample of events consists of 21 M&A announcements made by the five largest consulting engineering companies between 2009 and 2019. We considered, as relevant facts, acquisitions in which the target companies had at least EUR 90 million in revenues in the year prior to the year of the announcement. The cutting point was justified by the high annual revenue of the acquiring companies at the time of the event (more than EUR 1000 billion in all cases). The dates of the events were obtained from companies on annual reports and cross-checked with information from the Crunchbase platform, a site specialized in financial information from private and public companies at the international level.
The closing price data of the five largest consulting engineering companies were obtained from the Yahoo Finance database, from the BatchGetSymbols package in the statistical software R. For the market model, the counterfactual returns were computed based on the stock indices related to the location in each of the acquiring companies that were traded. For the synthetic control model, the counterfactual returns were computed based on the set of the main individual shares that were traded on the stock exchange of the respective acquiring company. For the consulting engineering companies, Jacobs and AECOM were the companies that made up the S&P 500 index in August 2020. In the case of WSP and SNC, the controlling group was composed of the other companies that made up the S&P/TSX in August 2020, and the 100 largest shares that made up the AMX Composite Index in August 2020 formed the controlling group associated with Arcadis. Table A1 (Appendix A) reports the main details related to the 21 events analyzed, discussing the extension of the estimation window adopted for calculating the coefficients associated with the market model and determining the relative weight of the individual shares of the respective control groups in the construction of the counterfactual return via synthetic control. Figure 2 reports the cumulative average abnormal returns (in %) of the companies for the event window (−10 days, +10 days) based on the market model ( Figure 2: Panel a) and the synthetic control model (Figure 2: Panel b). The results show that all companies present value creation from the M&A strategy. In both models, the SNC company reported the most positive average market reaction (3.90% in the market model and 4.87% based on the synthetic control model), while the WSP company presented the lowest cumulative average abnormal return (2.66% in the market model and 2.81% in the synthetic control approach).

Results
Mathematics 2021, 9, x FOR PEER REVIEW 10 of 21 Figure 2 reports the cumulative average abnormal returns (in %) of the companies for the event window (−10 days, +10 days) based on the market model ( Figure 2: Panel a) and the synthetic control model (Figure 2: Panel b). The results show that all companies present value creation from the M&A strategy. In both models, the SNC company reported the most positive average market reaction (3.90% in the market model and 4.87% based on the synthetic control model), while the WSP company presented the lowest cumulative average abnormal return (2.66% in the market model and 2.81% in the synthetic control approach).  The estimated abnormal returns show a very similar pattern in both methodologies ( Figure 3). The estimated effects (Figure 3: Panel a) differed slightly in magnitude between the market and synthetic control models through the analyzed events, being robustly equivalent to each other. The Scatterplot analysis (Figure 3: Panel b) confirms the strong correlation between the estimated effects, highlighting the robustness of the results obtained according to both methodologies. In this context, as in Castro-Iragorri (2019) [14], our evidence supports the quality of performance of the market model in the projection of returns obtained by companies from M&A processes. The estimated abnormal returns show a very similar pattern in both methodologies ( Figure 3). The estimated effects (Figure 3: Panel a) differed slightly in magnitude between the market and synthetic control models through the analyzed events, being robustly equivalent to each other. The Scatterplot analysis (Figure 3: Panel b) confirms the strong correlation between the estimated effects, highlighting the robustness of the results obtained according to both methodologies. In this context, as in Castro-Iragorri (2019) [14], our evidence supports the quality of performance of the market model in the projection of returns obtained by companies from M&A processes.    Figure 3 report the statistical tests to infer the market reaction to the announcement of the conclusion of the M&As processes under analysis, according to the three estimation windows ((−10 days, +10 days), (−5 days, + 5 days), (−2 days, + 2 days)). The statistical significance of the cumulative average abnormal return (CAAR) estimator was tested based on the classic t-student inference test and the non-parametric test built from 100,000 bootstrap re-samples. Overall, our results indicate the positive impact of M&A announcements on market value by the five largest consulting engineering companies between 2009 and 2019 in the three estimation windows. The market reaction to the announcements ranged from 2.094% (market return approach) to 2.782% (synthetic control approach) in our main analysis (10-day window before and after the event), both being statistically significant at a 5% significance level. Companies showed significant and positive abnormal market returns when considering the (−5 days, +5 days) and (−2 days, +2 days) windows, with estimated effects ranging from 1.870% to 2.242% in all estimates, confirming investor perceptions of value generation for acquiring companies.

Results
From a theoretical point of view, another important observation is the fact that the cumulative abnormal average return does not present significance from the statistical point of view in the days before the M&A announcement in any of our 12 specifications ( Figure 4). Conversely, a positive and statistically significant market reaction is observed in all specifications, reaffirming the impact of the event on the market value of the companies.
Our results are in line with the evidence available in the literature and are at the upper threshold of estimates of M&A impact on the market value of acquiring companies. Weston et al. [6] consider that, in normal situations, the accumulated abnormal returns range from −2% (value destruction) to 2% (value creation) in the case of acquiring companies; however, Moeller et al. [12] suggest that negative returns are more common in the acquisition of public companies, which is not verified in the transactions under analysis. Mathematics 2021, 9, x FOR PEER REVIEW 13 of 21   The acquiring companies in our sample are characterized by intensive R&D and capillarity in their production structure, with assets and production of goods and services in multiple countries-factors also associated with value creation through M&A (in this case company expertize) is considered an important factor for the absorption of the transmission channels resulting from the synergy gains from M&A. International activity, on the other hand, potentializes the gains resulting from cross-border acquisitions, through technology transfer, exchange rate variation, and economies of scale, when potentializing the market for companies (Bednarczyk et al. [3]). This factor is especially relevant, since all companies operate in at least forty different countries, taking into account that twelve of the events analyzed characterized acquisitions made outside the country of origin of the acquiring company.
Another point associated with the market reaction is the size of the acquiring companies (market capitalization), which affects abnormal returns through two congruent effects. The first effect is summarized by the positive relationship between company size and bargaining power in the M&A negotiation process. The second effect concerns the perception of investors about the uncertainty (risk) of the business produced, which tends to be minimized when the acquiring company already presents market consolidation (Wilcox et al. [15]).

Conclusions
Companies in various sectors have different strategies and skills when it comes to generating and capturing opportunities to create market value. We conducted an empirical study on the role of mergers and acquisitions on the market returns of the world's leading consulting engineering companies, assessing the importance of this mechanism in generating market value for them. We found important evidence that companies' inorganic growth strategies had a positive impact on their market returns, based on a sample of the twenty-one major M&A events that occurred between 2009 and 2019. The positive market reaction to the announcement of M&A events indicates that the acquisition process generates opportunities for the diffusion of technology, the increase of effective market demand, and capturing revenue synergies. This can be important information for companies, since they can consider the existence of abnormal market reactions in the decision process in takeover bids (positive externality generated). The event study model shows interesting results, reaching the objectives intended by its implementation. In addition, the synthetic control method strengthens the results achieved in the classic model.
Our methodology is theoretically very relevant for consulting engineering companies, and its practical application in companies is currently the subject of our research. A study is currently being applied in these companies, and practical results are expected after its implementation period.
This study offers a number of implications in several dimensions, making it possible for companies to easily achieve improved performance and growth, based on a cooperative approach.
Considering the range of the approach of our article, we recognize that further investigations can be carried out to understand the mechanisms of transmission of M&A announcements on market returns of other companies in the sector, analyzing whether there is financial contagion on the market returns of other companies. Bera et al. [29] find that the effects of risk factors on average returns vary over time scales due to their coefficient magnitudes and statistical significance, based on the multi-stage wavelet approach, for the period July 1963 to February 2018. This would be a relevant contribution to the construction and management of portfolio and risk management associated with the sector.
In addition, it would be interesting to consider a sample with a larger number of players in the consulting engineering sector, to build cross-section regressions and infer the contribution of corporate and financial factors on the creation of market value for the acquiring companies, in order to understand the role of the heterogeneities present in the sector on the abnormal market returns in M&A events.

Conflicts of Interest:
The authors declare no conflict of interest.

NYSE Composite Index
The 500 companies in S&P 500 at August 2020.
The same estimation window was adopted for the event (JACOBS-Blue Canopy Group), because the proximity between both acquisitions.