Labour share of income (Part 1 – Theories and measurement) Phuah Eng Chye (26 May 2018) At the macroeconomic level, the impact of landscape change on labour can be gauged by changes in the labour share of income or the share of national income paid in wages. Noah Smith notes “for decades, macroeconomic models assumed … “Labour share of income (Part 1 – Theories and measurement)”