The authors present models in which price discrimination in the context of a two-part price can occur in some competitive markets. Purchases take place in groups, which choose which firms to patronize. While firms are perfectly competitive with respect to groups, they have some market power over...

In this paper, we derive a discrete choice model of the demand for medical care from a theoretical model that implies a natural interrelation between price and income. We show that, in the context of a discrete choice model, if health is a normal good, then the price elasticity of the demand for...

A risk-averse man will invest in his sister's children if he cares about his genetic relatedness to future generations and if he is unsure about being the father of his wife's children. The model in this paper is an advance over the earlier expected-relatedness models in that it permits mixed...