In the United States, a patent lasts

If there are only two goods and these are consumed in fixed proportions, the price elasticities of demand for these two goods will sum to

a. 0.0 b. -0.5 c. -1.0 d. a number between 0 and -1.

Which of the following would shift the production possibilities frontier outward?

a. a reduction in inefficiency b. a reduction in the size of the labor force c. an improvement in technology d. a change in the combination of goods produced e. increasing opportunity costs