When the price of a good is $5, the quantity demanded is 100 units per month; when the price is $7, the quantity demanded is 80 units per month. Using the midpoint method, the price elasticity of demand is about

Unemployment rates were much higher in the 1980s than they were in the 1950s basically because

A) a higher percentage of the population was in the labor force in the 1980s, but the cost to many of them of being unemployed was much lower than it was in the 1950s. B) automation has eliminated many unskilled jobs. C) fewer jobs are available in the 1980s relative to the population. D) inflation raises unemployment rates. E) recessions have become much more severe since the 1950s.

A decrease in the price of a substitute shifts the demand curve to the _______

a. right b. left c. it does not change the demand curve d. none of the above