In the later part of the twentieth century, the price of crude oil began to increase after decades of relatively steady prices, which of the following could explain this phenomenon?
A) Worldwide reserves have been increasing.
B) Worldwide demand has been increasing.
C) Global warming
D) Extraction technology has been degrading.
B
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Jones and Smith are teaching assistants. Jones can grade 20 essays or 50 problem sets a day, while Smith can grade 20 essays or 10 problem sets a day. Therefore
A) Smith sacrifices 2 graded essays for every 2 problem sets she grades. B) Smith sacrifices 10 graded essays for every 20 problem sets she grades. C) Jones sacrifices 2 graded essays for every 5 problem sets he grades. D) Both Smith and Jones have a comparative advantage in grading essays.
The expansion of capital that can occur in the long-run but not, by definition, in the short-run, means that the long-run supply is
a. perfectly horizontal while the short-run supply curve is upward sloping. b. sloping downwards while the short-run supply curve is upward sloping. c. less elastic than the short-run supply curve. d. more elastic than the short-run supply curve.