monopsony

A market situation in which there is only one buyer for a product.

Our next task is to consider the change in the amount of a commodity purchased when the market changes from an indefinitely large number of competing buyers to a single buying agency. This may be described as the comparison between competitive and monopsony buying, just as the corresponding comparison for selling was called the comparison between competitive and monopoly output.

It appears to follow that employment, far from falling, may be raised by an adroitly contrived legal minimum wage or collective agreement. Indeed, this proposition is an important one in the theory of both wage regulation and trade unionism. Its applicability is sometimes limited, however, even when monopsony is significant, by the danger that the employer may be driven out of business completely, as when, because of his own irremediable inefficiency or other objective disadvantages, monopsony profit achieved at his workers' expense is the differential between hanging on and outright failure.

A buyer with disproportionate power.

The result is different when the resource buyer is a monopsony. The monopsony firm is a single buyer, and therefore it faces the market supply curve.

If the takeover is approved, Comcast would control 20 of the top 25 cable markets,[…]. Antitrust officials will need to consider Comcast’s status as a monopsony (a buyer with disproportionate power), when it comes to negotiations with programmers, whose channels it pays to carry.