In a perfectly competitive market,it pays the profit-maximizing firm to employ another unit of an input as long as the

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In a perfectly competitive market, a profit-maximizing firm will continue to employ additional units of an input as long as the cost of doing so (the increase in the firm's costs) is less than the revenue generated from selling the additional output produced (the price of the output times the increase in total product). This ensures that each additional unit of input contributes more to revenue than it adds to costs, thereby increasing profit.

In a Perfectly Competitive Market,it Pays the Profit-Maximizing Firm to Employ