The employer's demand curve for labour is represented by the

The employer's demand curve for labor is represented by the marginal product curve of labor. The marginal product curve shows the additional output that can be produced when one more unit of labor is employed, while holding all other inputs constant. The employer will continue to hire more labor up to the point where the marginal cost of hiring an additional worker (wage) equals the marginal product of labor (the additional output the worker produces). Therefore, the marginal product curve represents the employer's demand for labor.