The fundamental invention underpinning the 1995-2012 rise in the average rate of productivity growth is the:

If doubling the quantity of inputs more than doubles the quantity of outputs, the firm is experiencing

a. increasing returns to scale. b. decreasing returns to scale. c. constant returns to scale. d. increasing costs per unit of output.

In which of the following market structures do you find barriers to entry?

A. a monopoly B. a perfectly competitive market C. a monopolistic competition D. Both a monopoly and a perfectly competitive market are correct