13 sellers and 13 buyers are each willing to buy or sell one unit of a good, with values {$13, $12, $11, $10, $9, $8, $7, $6, $5, $4, $3, $2, $1}. If there is a single monopoly market-maker who keeps as profit the difference between bid and ask prices, the equilibrium quantity traded in the market is:   A. 7.   B. 4.   C. 1.   D. 10.   Why?

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