Labor economics often assumes that wages w are equal to the marginal revenue product of labor MRP L. However, recent literature has shown that firms' market power allows them to pay wages substantially below marginal productivity. The markdown (MRP L - w)/w is our preferred measure of firms'...

Recent empirical studies have revealed that labor market monopsony is far more common than previously thought, and that there is a strong correlation between wage suppression and labor market concentration. Yet few antitrust cases have been brought by workers against employers who exercise...