In a simple temporary general equilibrium model, it is shown that, if the number of firms is small, imperfect price competition in the markets for goods may be responsible for the existence of unemployment at any given positive wage. In the authors' examples involving two firms facing their...

We develop an overlapping generations model, where firms (as consumers) have a two-period life, investing in R&D during the first period and competing in the product market in the second period. The number of firms is endogenously determined and the set of successful firms by a Bernoullian...