Delimitação de mercado usando testes baseados em preço: uma análise econométrica


IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia




The competitive strategy of a firm is defined by choosing one alternative over the rivals, from differentiated activities set to deliver a product or service (strategic positioning). If firms cooperate or collude with each other, they dont have choices conflict and the strategy would not be necessary. To verify if several firms in the same market are in collusion, the responsible economic defense agencies considers the hypothesis that firms are in monopolistic competition (known as the hypothetical monopolist approach). Coe, Krause (2008) made an empirical study with the methods commonly used to evaluate the price-based approaches using synthetic data obtained from a market simulation with differentiated products. However,the authors consider a market structure where firms try to maximize profit without the constraint that, in long run, economic profit is zero. The aim of this work was to generate synthetic data considering the monopolistic competition and analyze if two econometric tests,Augmented Dickey-Fuller (ADF) and co-integration, can be used to delimitate this market structure. Since it was considered that the market consists of firms that have products with substitutes, the trends of the firms prices was stationary over time and therefore the price series should be correlated and co-integrated. In addition, it was analyzed what would happen to the equilibrium prices when an importing company, for example, a product that would be considered a substitute by the consumers, but had no problems related to the increased cost of production in the domestic market. It was observed that the importing firms, when its price was lower than that the other firms in the domestic market, tend to slow the increase of the firms price.


teste adf co-integração administracao monopolistic competition adf test co-integration competição monopolística

Documentos Relacionados