Considering the various data sources, survey types and indicators: To what extent do conclusions regarding changing income inequality in Switzerland since the early 1990s converge?

We compared time series of eight different data sources (HBS, SLFS, SESS, SHP, SILC, SHS, SPS, tax data) and calculated various inequality measures (Gini coefficient, Atkinson coefficient, Theil’s T, MLD, SCV, p90/p10, p80/p20, p50/p10, p90/p50) for the period from 1990 to 2012. While the level of inequality varies strongly across surveys, the results concerning the evolution over time are rather coherent. For disposable household income, inequality has remained stable, but evolves parallel to the business cycle of the Swiss economy. For individual employment income, findings across datasets are less consistent.