Haig–Simons income, Schanz–Haig–Simons income, or Haig-Simons-Hicks income is an income measure used by public finance economists which defines household income as consumption spending plus change in net worth. It is represented by the accounting identity:
In empirical, national-accounting practice, the biggest difference between Haig-Simons income and more widely-employed Household or Personal income measures is the inclusion of accrued household holding or "capital" gains due to assert-market price/(re)valuation changes in the Haig-Simons measure. In simplified accounting-identity terms:
