User:Oceanflynn/sandbox/The World Wealth and Income Database

The World Wealth and Income Database (WID) is an extensive, open and accessible database "on the historical evolution of the world distribution of income and wealth, both within countries and between countries".

History
Pioneers of income inequality studies include Simon Kuznets ( 1901 – 1985) 1953, and A. B. Atkinson and Alan Harrison in 1978.

In 1953 Kuznet published Shares of Upper Income Groups in Savings Kuznets, an American economist, statistician, demographer, economic historian, and winner of the 1971 Nobel Memorial Prize in Economic Sciences identified historical series of economic movements became known among economists and economic historians as "Kuznets Cycles", and alternatively as "long swings" in the economy's growth rate (following the work of Moses Abramovitz [1912-1999].

Thomas Pikkity
In Capital is Back, University of California at Berkeley's French economist Gabriel Zucman and Thomas Piketty investigate the evolution of aggregate wealth-to-income ratios in the top eight developed economies, reaching back as far as 1700 in the case of the U.S., U.K., Germany, and France, and find that wealth-income ratios have risen from about 200-300% in 1970 to 400-600% in 2010, levels unknown since the 18th and 19th centuries. Most of the change can be explained by the long-run recovery of asset prices, the slowdown of productivity, and population growth. Zucman is mostly known for his research on tax havens, popularized in his book The Hidden Wealth of Nations.