"Correlation" is a measure of how one variable causes another to change

Official data on unemployment are based on

A) a survey of households by the Bureau of the Census. B) employer data on hiring rates. C) the number of actual payments for unemployment compensation. D) the number of claims for unemployment compensation. E) the number of responses to ads in the help-wanted section of major newspapers.

Which of the following is true for both perfect and monopolistic competition?

A) Firms produce a differentiated product. B) Firms face a downward sloping demand curve. C) Firms produce a homogeneous product. D) There is freedom of entry and exit in the long run.