A firm is a monopsonist if it is the only employer which hires some particular factor of production. You either work for this firm or you don't if you're supplying labor in such a market. This gives the firm some market power in hiring just as being a monopoly seller gives a firm some market power in selling.
Specifically a monopsonist faces the entier factor supply curve when hiring just as a monopoly buyer faces the entire market demand curve when selling. As we shall see this makes all the difference.
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