11- From a purely economic point of view, discrimination exists when

a. black teenagers earn more than white teenagers.

b. all factors are earning average products.

c. women earn less than men.

d. equivalent factors earn different payments for equal contributions to output.

12- With a negative income tax, if people get at least $10,000 and the breakeven point is $50,000, what is the tax rate?

a. 50 percent

b. 25 percent

c. 20 percent

d. 5 percent