21b. What curve plays the role of the firm's demand curve for labor when the real wage is plotted on the vertical axis? 22. Suppose the following equations represent the demand for two firms demanding a particular type of labor. The curves are expressed as functions of the real wage. Firm 1: LI: 50 (W/P). Firm 2: L2: 25 0.5(W/P). 22a. Plot the two curves on the same axes and then construct the market demand. 22b. Find the equation for the market demand curve