5. In the case of oligopoly markets, self-interest prevents cooperation and leads to an inferior outcome for the parties involved. (A)O(B)X

1. When a payroll tax is enacted^ (A) the wage received by workers falls and the wage paid by firms rises. (B) the wage received by workers falls and the wage paid by firms falls. (C) the wage received by workers rises and the wage paid by firms falls. (D) the wage received by workers rises and the wage paid by firms rises,