Consider a production function that only uses labor as its variable input, and all other inputs are fixed. Within this procution, it is optimal to hire labor units in the short run as long as:______.
1) value marginal product of labor is greater than wage.
2) marginal product of labor is less than product price.
3) average product of labor is greater than wage.
4) value marginal product of labor is less than product price.

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