We show the incentive for divisionalization by a monopolist producer. In contrast to the previous literature, where divisionalization occurs for product market advantage, we show that divisionalization occurs if it provides strategic advantage in the labor market. With unionized labor market, we...

In a successive Cournot oligopoly, we show the welfare effects of entry in the final goods market with no scale economies but with cost difference between the firms. If the input market is very concentrated, entry in the final goods market always increases welfare. If the input market is...