According to the Case in Point on The Monopsony-Minimum Wage Controversy, the fact that some studies have found that increases in the minimum wage have led to either increased employment or no significant reductions in employment:

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The fact that studies have found varying effects on employment in response to increases in the minimum wage suggests that a perfectly competitive labor market may not exist. In a perfectly competitive labor market, wages and employment levels are determined by supply and demand, with no single buyer or seller having any significant ability to control these factors. The fact that changes in the minimum wage seem to have different effects on different employers and employees suggests that there are other factors at play, such as market power, that are distorting the competitive equilibrium.

According to the Case in Point on the Monopsony-Minimum Wage