For a firm in perfect competition, a diagram shows quantity on the horizontal axis and both the firm's marginal cost (MC) and its marginal revenue (MR) on the vertical axis. The firm's profit-maximizing quantity occurs at the point where the
A) slope of the MC curve is zero.
B) MC and MR curves are parallel.
C) MC curve intersects the MR curve from below, going from left to right.
D) MC curve intersects the MR curve from above, going from left to right.
C
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The interest rate effect that helps explain the slope of the aggregate demand curve arises because
A) an increase in the price level lead to decreases in interest rates, which induces more borrowing and hence raises planned real expenditures. B) interest rates and total planned real expenditures are unrelated. C) an increase in the price level boosts interest rates, which discourages borrowing and hence reduces planned real expenditures. D) a decrease in the price level boosts interest rates, which discourages borrowing and hence frees up income for more planned real expenditures.
Government statisticians adjust GDP figures to include estimates of
A) the value of homemaking (work done within the home). B) the underground economy. C) child-rearing services provided by stay-at-home parents. D) the costs of pollution to society.