In the circular flow model, households supply resources such as labor services in the factor market

It is efficient to produce an additional shirt if the

A) marginal social benefit of producing the shirt is greater than zero. B) marginal social benefit of producing the shirt is zero. C) marginal social benefit of producing the shirt is greater than the marginal social cost of producing it. D) total social benefit from producing shirts is maximized.

The GDP of a country can be derived by summing

a. the expenditures on final user goods and services produced domestically during the year. b. the payments to employees and owners of capital resources and then subtracting depreciation and indirect business taxes. c. the market value of all goods and services produced domestically during the period and then subtracting net exports from that figure. d. the income payments to the resource suppliers and net exports.