Most students expect that if they spend more time studying, the outcome will be improved grades in the course. This supposes that:
a. a positive relationship exists between studying and grades.
b. a negative relationship exists between studying and grades.
c. grades are independent variables

Which of the following statements is true about the price elasticity of demand?

A) As the number of substitutes for a product increases, the price elasticity of demand for that good decreases. B) If the budget share of a particular good in a consumer's bundle increases, the price elasticity of demand for that good is likely to decrease. C) The price elasticity of demand for a good is generally higher in the long run than in the short run. D) The demand for a good with a price elasticity of demand of zero is highly responsive to price changes.

Explain whether Delta Airlines' sales are likely to fluctuate more or less than the sales of each of the following firms as the economy moves from recession to expansion and back to recession

Whirlpool Corporation (appliance manufacturer) Taco Bell The Boeing Company (aircraft manufacturer) GameStop (video game sales and rentals)