The vertical distance between the average total cost curve and the average variable cost curve equals:
a. marginal cost

In the simple linear regression model Yi = ?0 + ?1Xi + ui,

A) the intercept is typically small and unimportant. B) ?0 + ?1Xi represents the population regression function. C) the absolute value of the slope is typically between 0 and 1. D) ?0 + ?1Xi represents the sample regression function.

Patents are most likely to infringe on innovation:

A. for products that incorporate many different technologies into a single product. B. of simple, easy-to-copy products. C. in the pharmaceutical industry. D. when they cause creative destruction.