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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If increases in the minimum wage have led to either increased employment or no significant reductions in employment, it suggests that there may not be a competitive labor market. If there were a competitive labor market, an increase in the minimum wage would lead to a decrease in employment because employers would have plenty of workers to choose from and could hire the lowest-cost workers. However, if there are few employers and many workers, a monopsony or bilateral monopoly may exist, and a minimum wage increase could actually lead to increased employment as employers compete for a limited pool of workers.

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