An economy is operating with optimum efficiency if
a. the price of the product is greater than marginal cost.
b. the production of more of commodity A entails the production of less of commodity B.
c. marginal cost of output is greater than marginal utility of output.
d. an increase in output would result in a decrease in average cost per unit.
b
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Based on the figure below. Starting from long-run equilibrium at point C, a tax cut that increases aggregate demand from AD to AD1 will lead to a short-run equilibrium at point ________ and eventually to a long-run equilibrium at point ________, if left to self-correcting tendencies. 
A. D; C B. B; C C. B; A D. D; B
The accompanying figure shows a single consumer's demand for ice cream at the student union.
The student union sells a total of 7,200 scoops of ice cream each week at a price of $2.00 per scoop. If every student who buys ice cream has the demand curve shown above, then there must be ________ students purchasing ice cream each week.
A. 1,500 B. 800 C. 1,200 D. 2,000