Union membership in the United States displayed a ∩-shaped pattern over the 20th century, while income inequality … the economy. Firms hire capital, plus skilled and unskilled labor. Unionization is a costly process. A union chooses how … many firms to organize and the union wage. Simulation of the model establishes that skill-biased technological change …

collective bargaining -- Union strategies and structures for representing workers -- Union organizing and bargaining structures …