At what point should a profit-driven competitive firm continue to employ additional workers?

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When the wage rate, capital rental cost, and land rental price are identicalWhen the marginal product of labor drops to zero and output reaches its peakWhen the value generated by an additional worker equals the wage paidWhen the marginal product of labor is equal to the wage rate

Explanation

A competitive firm maximizes profit by hiring labor up to the point where the value of the marginal product of labor matches the wage. This ensures the cost of hiring an additional worker is exactly covered by the revenue they generate.