The WTO allows trade protection to protect endangered species

A decrease in the marginal tax rate, with the average tax rate held constant, will

A) increase the amount of labor supplied at any real wage. B) not affect the amount of labor supplied at any real wage. C) decrease the amount of labor supplied at any real wage. D) increase the amount of labor supplied at any real wage if the average tax rate is above the marginal tax rate, but decrease the amount of labor supplied at any real wage if the average tax rate is below the marginal tax rate.

We observe a market where the price has risen and the quantity being sold has declined. This could be caused by a(n):

a. Increase in demand b. Increase in supply c. Decrease in demand d. Decrease in supply