As Bubba's Bubble Gum Company adds workers while using the same amount of machinery, some workers may be underutilized because they have little work to do while waiting in line to use the machinery. When this occurs, Bubba's Bubble Gum Company encounters

If one is interested in knowing whether or not a pair of products are substitutes, one would be interested in the value of the: a. elasticity of supply

b. price elasticity of demand. c. income elasticity of demand. d. cross-price elasticity of demand.

An explanation for why the short-run aggregate supply curve is upward-sloping is because:

a. nominal incomes are fixed. b. the quantity of real output supplied is inversely related to the aggregate supply curve. c. an increase in price will increase the supply of money. d. the capital-output ratio.