Abstract This paper proposes a model of a continuum of industries in which some industries are monopolistically competitive, the others are oligopolistic, and they interact in a labor market. We use this model to examine the effects of entry of oligopolistic firms. We show that this raises the equilibrium wage and induces exit of monopolistically competitive firms. Then, we find that the profits of each oligopolistic firm and the whole oligopolistic industry decrease. Finally, we establish that if the elasticity of substitution is the same in all industries, welfare improves as a result of an increase in the oligopolistic firms.

中文翻译：

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垄断竞争与寡头垄断并存时的进入效应

摘要本文提出了一个产业连续体模型，其中一些产业是垄断竞争的，其他产业是寡头垄断的，它们在劳动力市场中相互作用。我们使用这种模型来检验寡头企业进入的影响。我们证明，这提高了均衡工资并促使垄断竞争企业退出。然后，我们发现每个寡头垄断企业和整个寡头垄断行业的利润都在下降。最后，我们确定，如果所有行业的替代弹性都相同，则寡头企业数量的增加将改善福利。