If the price elasticity of supply equals zero, this implies that:
a. suppliers can easily change the quantity supplied of the product as the price of the product changes.
b. the period under consideration is a very long-run time period.
c. the supply curve is perfectly vertical.
d. the percentage change in quantity supplied exceeds the percentage change in product price.
e. the percentage change in quantity supplied equals the percentage change in product price.
c
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From an economists' perspective, which of the following observations is not true? a. Self-interest is purely monetary in nature
b. Self-interest can include benevolence. c. Self-interest is a good predictor of human behavior in most situations. d. Self-interest is not the same as selfishness.
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