Barter requires a double coincidence of wants. This means that:
a. at least two traders must demand a commodity.
b. any two traders involved in a transaction must have money.
c. each trader must demand at least two commodities.
d. either of the two traders involved in a transaction must have money.
e. when two traders are involved in a transaction each trader must want what the other has to offer.
e
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You are studying with a friend, and your friend says "To maximize utility, a consumer must consume the combination of goods so that the marginal utility of good X equals the marginal utility of good Y
" Explain whether your friend's statement is correct or incorrect.
Assume that foreign capital flows into a nation rise due to expected increases in stock market appreciation. If the nation has highly mobile international capital markets and a fixed exchange rate system, what happens to the real GDP and net nonreserve international borrowing/lending balance in the context of the Three-Sector-Model? a. Real GDP rises and net nonreserve international
borrowing/lending balance becomes more positive (or less negative). b. Real GDP rises and net nonreserve international borrowing/lending balance becomes more negative (or less positive). c. Real GDP falls and net nonreserve international borrowing/lending balance becomes more positive (or less negative). d. Real GDP and net nonreserve international borrowing/lending balance remain the same. e. There is not enough information to determine what happens to these two macroeconomic variables.
As a general rule, zero pollution is not socially desirable because
A. there would be no production. B. the Environmental Protection Agency (EPA) needs to have something to do. C. no pollution would lead to global warming. D. all of these answer options are correct.
Refer to the information provided in Figure 8.4 below to answer the question(s) that follow. 
Figure 8.4 Refer to Figure 8.4. If twelve microwave ovens are produced, Micro Oven's total fixed costs are
A. $25. B. $41.67. C. $50. D. $300.