How many people are employed if the labor force participation rate is 60%, there are 3 million people unemployed, and there are 30 million people not in the labor force?

If we ignore the negative or positive sign, the midpoint method of calculating a percentage change in price between two points on a demand curve results in

A) a smaller percentage change if the price rises than if it falls. B) the same percentage, regardless of whether the price increases or decreases. C) the price elasticity of demand. D) the price elasticity of supply. E) a higher percentage change if the price rises than if it falls.

According to most economists, reducing automobile emissions to zero would be:

a. optimal. b. inefficient. c. beneficial. d. impossible.