Suppose there are 11 buyers and 11 sellers, each willing to buy or sell one unit of a good, with values {$14, $13, $12, $11, $10, $9, $8, $7, $6, $5, $4,}. Assume no transaction costs and a competitive market. If there is a market maker in this market. What is the profit maximizing bid-ask spread per unit for a market maker?

a. $6 bid; $12 ask
b. $7 bid; $11 ask
c. $8 bid; $10 ask
d. $9 bid; $9 ask


a

Economics

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