International data on the history of real GDP growth rates shows that over the last 120 years or so, rich countries got richer and poor countries got poorer

Comment on the following statement: "In order for a natural monopoly to be present, economies of scale must be realized at a scale that is close to total demand in the market."

What will be an ideal response?

The supply of labor in the classical system is a function of the

a. marginal product of labor. b. real wage. c. the public's preference for leisure. d. money wage. e. b and c