Price elasticity of demand is a useful tool for classifying firms that exist within the same market

Which of the following statements is true of the marginal product of an input?

A) The marginal product of an input is given by the ratio of the firm's total output to the units of the input used. B) The marginal product of an input increases as more and more inputs are used. C) The marginal product of an input can take negative values. D) The marginal product of the first unit of a variable input is zero.

If nuts and bolts are complements, an increase in the price of nuts caused by a change in the supply of nuts will a. increase the number of bolts sold. b. decrease the demand for nuts c. increase the price of bolts

d. decrease the number of bolts sold