If the consumption function is C = 20 + 0.5YD, then an increase in disposable income by $100 will result in an increase in consumer expenditure by

What is true along the demand curve for a resource?

a. Prices of other resources are assumed constant. b. The marginal product of that resource remains constant. c. Total cost of production is assumed constant. d. The price of that particular resource is assumed constant. e. The quantity of that particular resource is assumed constant.

A positive externality is present whenever: a. the social marginal benefit of an activity exceeds the private marginal benefit. b. the private marginal benefit of an activity exceeds the private marginal cost. c. the social marginal cost of an activity exceeds the private marginal cost

d. none of the above.