Because a monopsony must raise the wage on all labour hired in order to hire more labour,

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In a monopsony, to hire additional labor, the employer must raise the wage not just for the additional labor but for all the labor already employed. This means the marginal cost of labor (MCL) is higher than the wage (W) paid to the last unit of labor because it includes the increased wages for all previous units of labor.

Because a Monopsony Must Raise the Wage on All Labour