Under long-run perfect competition, which of the following are the same (equal) at all levels of output?
a. Price and marginal cost.
b. Price and marginal revenue.
c. Marginal cost and marginal revenue.
d. All of these.
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
If opening up international trade resulted in the U.S. importing ballpoint pens, what would tend to happen to the U.S. price of ballpoint pens? a. The domestic price will fall
b. The domestic price will rise. c. The domestic price will remain constant. d. It is impossible to predict the impact.
Investing in financial instruments in today's economy:
A. is an activity practiced only by the wealthy. B. is made easier by the use of mutual funds. C. involves costly transactions. D. requires a relatively large sum of money to invest (more than $100,000).
In building a model the assumption that allows economists to study only the factors being analyzed is the
A) rationality assumption. B) ceteris paribus assumption. C) the self-interest assumption. D) the scarcity assumption.