We have already studied how the market functions when buyers and 
sellers are dealing with goods and services: firms supply goods and 
services in response to the equilibrium price, and households buy these 
goods and services in response to the equilibrium price.  The combined effects 
of their decisions and behavior determine whether the market equilibrium 
stays steady, or if it shifts with changes in the supply and demand 
curves.
Similarly, there is a market for labor: individuals decide how willing they 
are to supply labor (hours of work), and firms decide how willing they are to 
buy labor.  (Note that in labor markets supply and demand are the reverse of 
that for goods and services markets: in labor markets, firms make up 
labor demand, and individuals make up labor supply).  The combination of 
supply and demand curves for labor determines how much labor is purchased, and 
at what price.  (Labor price is usually called a wage, the amount of money 
paid for a unit of work).  Firms decide how much labor they want based on the 
wage and the amount of work they need to get done.  Individuals decide how much 
labor they want to supply based on the wage and the trade-off between 
consumption and leisure, as seen in the Labor 
Supply unit.
In this unit, we will study Labor Demand: examining the behavior of firms in the 
labor market, learning how labor demand curves are determined, and observing 
market equilibrium.