Cross elasticity among goods in a perfectly competitive market is infinite

When compared to the demand curve for only one variable input, the demand curve for a factor input when several inputs are variable is

A) less elastic. B) more elastic. C) vertical. D) horizontal.

If a college education did not increase worker productivity,

a. no one would go to college. b. the earnings of workers with a college education would tend to be the same as for workers without a college degree. c. the earnings of workers with a college education would still be higher than for those without a college degree. d. the earnings of workers with a college education would be lower than for those without a college degree.