In the study of economics, investment means:
a. the effect of stock prices on the production possibilities curve.
b. the accumulation of capital that is used to produce goods and services.
c. owning stocks and bonds.
d. the principle that the opportunity cost increases as the production of one output expands.
b
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Which of the following pairs of variables are likely to be positively correlated?
A) Income and consumption B) Price and consumption C) Education and unemployment D) Availability of health care and death rate
Which of the following best describes the foreign exchange market? It is a market where one country's
a. exports are traded for another country's imports b. currency is traded for that of another c. goods are traded for another country's services d. imports are traded for another country's exports e. services are traded for another country's goods
The economic way of thinking stresses that
a. changes in personal costs and benefits generally fail to exert much impact on behavior. b. incentives matter--individuals respond in predictable ways to changes in personal costs and benefits. c. if one individual gains from an economic activity, then someone else must lose and in the same proportion. d. if a good is provided by the government, its production will not consume valuable scarce resources.
Refer to the information provided in Figure 9.1 below to answer the question(s) that follow. 
Figure 9.1Refer to Figure 9.1. If this farmer maximizes profits, his per-bushel profit will be
A. $2. B. $4. C. $9. D. $15.