Labor share is the portion of national income paid to workers as wages, salaries, and related compensation, rather than to owners of capital such as profits, rents, or dividends. It is a useful macroeconomic indicator because it shows how income is distributed between labor and capital within an economy.
In AI and automation debates, labor share matters because productivity gains do not always raise wages at the same pace. If output grows while the labor share falls, tax systems that rely heavily on payroll taxes and social contributions can collect less revenue from the wage base. Policymakers track labor share to estimate how exposed public finances, household income, and employment-linked tax systems are to shifts toward capital income.