The profit-maximizing rule for employment of a variable input is to employ that input until its marginal revenue product is less than the marginal cost of the input, as long as the marginal cost of the input would be less than or at most equal to the marginal revenue product of the input for a greater quantity of the input.

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The profit-maximizing rule for employment of a variable input is to employ that input until its marginal revenue product equals the marginal cost of the input, not until the marginal revenue product is less than the marginal cost.

The Profit-Maximizing Rule for Employment of a Variable Input Is