A monopolist can force a consumer to buy a quantity larger than that dictated at by the consumers demand curve (at a given price).

Question

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In the case of all or nothing demand (Figure 6.2) the monopolist forces the consumer to buy Q2 units at a price of P1. The consumer goes along as long as the consumer surplus measured by area AP1E is larger than or equal to the consumer surplus loss measured by area EFG. For this very reason you may buy a foot-long hot dog at a ball game, eat some and throw the rest away because the consumer surplus from the part you eat is greater than that lost on the part that you throw away.

A Monopolist Can Force a Consumer to Buy a Quantity