A wage change can affect labor decisions through two competing channels. The substitution effect makes leisure relatively more costly when workers can earn more, while the income effect reflects how higher earnings alter desired work and leisure. The balance between these effects helps explain why workers may change their hours, occupational choices, or willingness to participate in employment.
Population size, worker skills, working conditions, and nonlabor income all shape the amount of labor available. A larger population may expand the pool of potential workers, while skills and workplace conditions influence occupational participation. Nonlabor income can also affect work decisions because households may rely less on wages when other income sources are available.
Labor supply reflects more than whether someone has a job. Workers also choose how many hours to offer and which occupations to enter. These choices determine how much labor is available across the market and across occupations. Changes in wages, working conditions, skills, or nonlabor income can therefore affect both total employment availability and its composition.
An analysis begins by examining how many workers are willing and able to work at relevant wage rates, then considers population, skills, working conditions, and nonlabor income. Economists connect these supply conditions with employer hiring outcomes to study equilibrium. This framework helps explain employment levels, wage determination, and differences in wages across labor-market settings.
Taxes or regulations can alter the conditions under which workers decide whether to work, how many hours to provide, or which occupations to enter. By changing incentives or the features of employment, they may influence the amount of labor offered. Studying these responses helps economists evaluate resulting changes in employment and wage outcomes.
Demographic and economic changes can modify the size, skills, or circumstances of the working population. Economists use labor-supply analysis to trace how those changes affect employment, wages, and occupational participation. The approach is useful for interpreting shifts in labor-market conditions and for understanding why wage differences or employment responses may emerge across groups or periods.