Assume that Joe is willing to produce another hamburger that costs $1 to make. Mary is hungry and is willing to buy a hamburger for $3. According to the No Cash on the Table Principle, Joe and Mary:
A.will only make a trade if Joe can get Mary to spend more than $3 for the hamburger.
B.will only make a trade if Mary can get Joe to charge less than $1 for the hamburger.
C.will never trade; they will look for better deals.
D.will make a trade.
正确答案:will make a trade.