This gives rise to a class structure, whose agricultural nomenclature would be landlords (who only hire labor), rich peasants (who hire labor and work themselves on their fields), middle peasants (who only work for themselves and do not participate in the labor market), poor peasants (who work on their own plot and sell labor), and landless laborers (who only sell labor). Independently of this taxonomy, individuals are either exploiters or exploited, depending upon whether they consume goods embodying more or less labor than they expend. The central result, the Class Exploitation Correspondence Principle (CECP), states that individuals who optimize by hiring labor are necessarily exploiters, and those who optimize by selling labor are exploited.