If at the current output of X the PX < MCX, then society gains by

Studies on consumer behavior have found that most people value fairness enough that they will refuse to participate in transactions they consider unfair, even if they are worse off as a result

How does this affect a firm's decision to raise prices in the event of a temporary increase in demand?

If the United States decides to trade with Yemen, we know that

a. Yemen will benefit, but trade with a less developed country could not benefit the United States. b. it will not benefit Yemen because workers in the United States are more productive. c. Yemen and the United States can both benefit. d. it will not benefit either country because their cultural differences are too vast.