Decomposing the Growth of Top Wealth Shares

What drives the dynamics of top wealth inequality? To answer this question, I propose an accounting framework that decomposes growth share aggregate owned by a percentile into three terms: within term, which is average individuals initially in relative to economy; between accounts for entering and exiting due changes their rankings; demography or death population growth. obtain closed‐form expressions each term wide range random models. Evidence from Forbes 400 list suggests half recent rise inequality.