hello! i just have a few questions such as The goal of macroeconomics is

a. to explain how economic changes affect prices of particular goods.

b. to devise policies to deal with market failures such as externalities and monopoly.

c. to explain changes that affect households and firms in general.

d. None of the above are correct.

If a production function has constant returns to scale, output can be doubled if

a. labour doubles.

b. any one of the inputs doubles.

c. all of the inputs double.

d. None of the above are correct.

Because the CPI is based on a fixed basket of goods, the introduction of new goods and services in the

economy causes the CPI to overestimate the cost of living. This is so because

a. new goods and services are always of higher quality than existing goods and services.

b. new goods and services cost less than existing goods and services.

c. new goods and services cost more than existing goods and services.

d. when a new good is introduced, it gives consumers greater choice, thus reducing the

amount they must spend to maintain their standard of living.