We study the market for vaccinations considering income heterogeneity on the demand side and monopoly power on the supply side. A monopolist has an incentive to exploit the external effect of vaccinations and leave the poor susceptible in order to increase the willingness to pay of the rich....

Adjustment costs cause movements of the labour share if the economy experiences demand or wage shocks. With linear adjustment costs and Cobb-Douglas technology, these movements are independent of the size of these shocks and depend only on the size of the adjustment costs.

A firm facing employment protection will defend its market position more fiercely than a firm operating without such restrictions. However, ex ante it will be more reluctant to expand its market position. For the benchmark case of contest competition, the defensive effect dominates. A firm...