Corporations can artificially create a monopsony, just like they can artificially create a monopoly. The music industry, for example, relies on making its talent pool—who are in high demand by the <i>customers</i>—feel like they are in lower demand compared to the record labels themselves, so the industry will be in a better bargaining position.<p>Sure, once the market is as efficient as it can be, if there's still a monopsony, that's tough for the employee. But if the monopsony can be annihilated without affecting its constituent employers and employees, all the better for all involved.