Abertura de capital, mobilidade de trabalhadores e diferenciais salariais: uma análise com dados em painel para o período de 2002 a 2008

Abstract

Wage inequality is a topic that assumes an important role in the quest for developing countries, with a large number of studies on the factors that generate social inequality. Characteristics of individuals, firms and regions are quoted as major determinants of such inequality. However, most studies found in the literature on the impacts of employers characteristics on wage differentials focus on physical factors of firms, such as size and sector. In addition, other factors that are related to the financial structure of firms may also generate wage effects since the financial security of firms is directly related to the welfare of its employees. To understand the effects of the financial restructuring provided by IPO firms on wage differentials, this study investigated the impact of IPO (Initial Public Offering) on workers wages. We also investigated the existence of differential income from labor mobility between public companies and non-public ones. For that, we used a balanced panel that connects two data sources: Rais Migra-MTE - Ministry of Labor and Employment - and Economática, covering the years 2002 to 2008.The strategy used in the study involved the estimation of wage differentials with the control of unobserved heterogeneity via fixed effects of workers. We used the methods of OLS, Random Effects, Fixed Effects and First Differences. Further tests were performed in order to verify the robustness and consistency of results. It was found that there is wage differential between workers in favor of individuals who change from non-public companies to publicly traded ones. This differential was about 13% by the method of OLS, but felt to less than half (6%) after controlling to unobservable effects of individuals. This reduction may reflect a greater ability of workers to move to public companies and that, by the method of OLS, was not controlled. In addition, there was a positive effect of 2% generated by the completion of the IPO in the wages of workers in the year of opening. This shows that even with the possible financial restructuring promoted by IPO (which, potentially, reduces risk by promoting access to other sources of capital), the event has a positive impact on the wages of their workers, which may be explained by organizational restructuring and portfolio that the company needs to undergo to go public. These results contribute to the advancement in the study of identifying the determinants of wage differentials, which is an important question still open in the economic literature.