Assume that the supply curve is horizontal because marginal cost is constant at $10.John,Robert,and Jimmy each value one compact disc at $20 but only Jimmy and John value a second compact disc (Jimmy at $5 and John at $15).It follows that the optimal number of compact discs sold in this market is
A) two.
B) three.
C) four.
D) five.

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The Answer of Assume that the supply curve is horizontal because marginal cost is constant at $10.John,Robert,and Jimmy each value one compact disc at $20 but only Jimmy and John value a second compact disc (Jimmy at $5 and John at $15).It follows that the optimal number of compact discs sold in this market is
A) two.
B) three.
C) four.
D) five.

Assume That the Supply Curve Is Horizontal Because Marginal Cost