Which of the following are barriers to entry?

Macroeconomics is concerned with studying the

A) behavior of individual decision makers. B) performance of the economy as a whole. C) prices of specific companies' stocks. D) wants of individual consumers.

Which of the following is not correct?

a. Economists use some familiar words in specialized ways. b. Economics has its own language and its own way of thinking, but few other fields of study do. c. Supply, demand, elasticity, comparative advantage, consumer surplus, and deadweight loss are all terms that are part of the economist's language. d. The value of the economist's language lies in its ability to provide you with a new and useful way of thinking about the world in which you live.