The most important U.S. anti trust law:

When the ________ effect dominates the ________ effect, the labor supply curve is ________

A) income; substitution; vertical B) substitution; income; positively sloped C) income; substitution; negatively sloped D) substitution; income; horizontal

At a boundary choice:

A. the consumer purchases at least some of every good. B. the consumer purchases no goods. C. the consumer does not spend all of her income. D. the consumer purchases some of at least one good but none of at least one other good.