Answer:
pay a wage rate less than labor's MRP
Explanation:
A monopsonistic employer in an unorganized (nonunion) labor market will: "pay a wage rate less than labor's MRP"
The above statement is based on the idea that Monopsony is a market situation whereby a single buyer or firm is the only purchaser of a good or service, which in most cases has to do with the purchase of labor.
And given the fact that the firm is the sole purchaser of labor, where there is no labor union, there is a high tendency that such firm or employer pays a wage rate less than labor's marginal revenue productivity.