A profit-maximising producer will hire labour to the point where [1] marginal revenue product equals the wage rate. [2] marginal revenue equals zero. [3] labour and capital costs are equalised [4] its marginal product equals marginal revenue.

A profit-maximising producer will hire labour to the point where

[1] marginal revenue product equals the wage rate.

[2] marginal revenue equals zero.

[3] labour and capital costs are equalised

[4] its marginal product equals marginal revenue.