A market maker faces the following demand and supply for widgets. Eleven buyers are willing to buy at the following prices: $15, $14, $13, $12, $11, $10, $9, $8, $7, $6, $5 . Eleven sellers are also willing to sell at the same prices. If the market maker decides to only make one transaction what is his profit/bid-ask margin
a. $8
b. $10
c. $12
d. $16
b
Economics
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