Which period of recent U.S. history shows the lowest rates of productivity growth?

The marginal revenue product

A) represents the incremental contribution to the firm's total revenues obtained from an increase in a variable input. B) always increases when there is an increase in a variable input. C) gives the increase in cost when there is an increase in a variable input. D) gives the change in total product when an additional unit of a good is hired.

Which of the following is not a determinant of demand for laptop computers?

A. Income of buyers of laptop computers B. The cost of inputs for producing laptop computers C. The prices of related goods such as software and iPads D. Expectations about the future price of laptop computers