Based on the above table, which shows the firms and sales in an industry, what is the approximate value of the Herfindahl-Hirschman Index?

A firm's isoquant shows:

a. the amount of labor needed to produce a given level of output with capital held constant. b. the amount of capital needed to produce a given level of output with labor held constant. c. the various combinations of capital and labor that will produce a given amount of output. d. none of the above.

Which of the following will most likely increase aggregate supply in the long run?

a. unfavorable weather conditions in agricultural areas b. an increase in the expected inflation rate c. higher real interest rates d. an increase in the rate of capital formation