There is also the factor of the “subjective cost of labour”, which is a person’s marginal disutility of labour (or marginal utility of foregone leisure) weighted by his marginal utility of income. Typically, this would give a positive value, and hence a positive reservation wage rate. The underlying issues have also been modelled as a case of “occupational choice” in the new literature on endogenous inequality, where the occupational choice space can be dichotomous, a multitude, or even a continuum.