The key concept that serves as the basis for the study of economics is:

Which of the following will increase the wage rate?

A) an increase in the adult population B) an increase in the retirement age C) an improvement in technology that increases the marginal product of labor D) Both answers A and B are correct.

A decrease in the relative price of economics textbooks will raise the aggregate quantity of an economy's goods and services demanded

a. True b. False Indicate whether the statement is true or false