At a price of $20 each, the demand for t-shirts from a group's fundraising activity is unit elastic. Thus, the group's total revenue from selling t-shirts ________ at a price of $20 each.

If the demand for a good is perfectly elastic, the price elasticity of demand is ________ and the demand curve is ________

A) infinite; vertical B) zero; vertical C) zero; horizontal D) infinite; horizontal

Which of the following is a behavioral implication of bounded rationality?

A) unbounded selfishness B) a rule of thumb C) a rational mistake D) a nervous breakdown