Page 3 8. (Figure: Market for Plumbers) If the market in this figure is in equilibrium, the hourly wage paid to plumbers is ______ and the marginal product of a plumber is ______. 9. When labor supply increases, the wage is expected to 10. The supply of nurses in country A is the same as the supply in country B, but the nurses in country A earn 90 percent more than the nurses in country B. What can explain this difference?