2. Assume that Joe is willing to produce a hamburger for $1, and Mary is willing to pay $3 for a hamburger.
Which of the following is true?
(A) Joe and Mary can make a mutually beneficial exchange.
(B) Joe and Mary cannot make a mutually beneficial exchange.
(C) Joe and Mary will not trade in equilibrium.
(D) Joe and Mary will only trade if the equilibrium price is less than $1.
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