factor market - shows how much the firm demands units of labor (or other factor)
- combines utility, isoquants, and market
- marginal revenue product of labor (MPRL) - additional revenue from the extra output that would result from hiring another unit of labor
- MPRL = (MR)(MPL)
- in competitive market, MR=P >> MPRL = (P)(MPL)
- will hire more if extra revenue exceeds the cost
- cost = wage = w >> usually constant
- cost function
- MPRL
- lower cost >> wage shift >> increased demand in labor