The slope of a demand curve is not used to measure the price elasticity of demand because
A) the slope of a linear demand curve is not constant.
B) the measurement of slope is sensitive to the units chosen for price and quantity.
C) the slope of a line cannot have a negative value.
D) the slope of the demand curve does not tell us how much quantity changes as price changes.
B
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To macroeconomists, investment is mainly the purchases of goods and services
A) by businesses. B) to hold as wealth, such as gold coins or art. C) to hold as wealth, such as stocks and bonds. D) by the government. E) ?b and c
Marginal factor cost is
A) the change in total costs due to a one-unit change in the quantity of the good produced. B) the change in total costs due to a one-unit increase in the variable input. C) the change in the price of an input when an additional unit of the input is hired. D) the marginal cost of changing the rate of production in the long run.