You increase the advertising intensity for your product in market A but not in market B. Sales in A rise from 1140 to 1180 units per week while sales in B fall from 1270 to 1230 . The Difference-in-difference estimate of the effect of the increased advertising is:

Which of the following could help explain why professional football players have high salaries?

a. There is little social status attached to the occupation. b. Their marginal revenue products are typically very low. c. They face a high chance of having their careers cut short. d. Many college football players want to become professional football players. e. The labor market is perfectly competitive due to the players' union.

An increase in both supply and demand causes which of the following?

A. Equilibrium price falls. B. Equilibrium price rises. C. Equilibrium price change is indeterminate. D. Equilibrium quantity change is indeterminate.