A simple Keynesian model is representative of a closed economy, with no foreign sector

In the Ricardian model, the marginal product of labor:

a. first rises, then falls, as more labor is employed to produce a good. b. first falls, then rises, as more labor is employed to produce a good. c. continuously falls, as more labor is employed to produce a good. d. does not change, as more labor is employed to produce a good.

________ motivates charitable giving because individuals value helping others

A) Pure altruism B) Rationalism C) Impure altruism D) Consumerism