Hidden Wealth Neil Cummins∗ July 1, 2020 Abstract I propose a method to measure hidden wealth using historical archives. Applying this to Eng- land, 1920-1992, it is revealed that elites conceal, at minimum, around 20% of their inherited wealth. Among dynasties, this hidden wealth, independent of declared wealth, predicts appear- ance in the Offshore Leaks Database of 2013-6, house values in 1999, and Oxbridge attendance, 1990-2016. Accounting for hidden wealth eliminates one-third of the observed decline of the top 10% wealth-share over the past century. I find 8,839 dynasties that are hiding at least £7.4 Billion. JEL: N00, N33, N34, D31, H26 Keywords: hidden wealth; inequality; economic history; big data; tax evasion ∗Economic history, LSE and CEPR. Email:
[email protected], neilcummins.com. Thanks to Olivier Ac- cominotti, Greg Clark, Morgan Kelly, Andy Summers, Patrick Wallis, Gabriel Zucman and seminar participants at Lucerne, Humboldt and the LSE for helpful suggestions. 1 1 Introduction The 20th century’s ‘Great Equalization’ of wealth in Europe and the United States was the result of the decline of the top wealth-shares. In England the wealth-share of the top 1% transformed from over 75%, in 1900, to less than 20% by 1970. New wealth created by the post-war ‘Golden Age’ of economic growth grew faster than net-of-taxes returns on capital (Piketty (2014), p.362-3). We base this stylized fact primarily upon observed, or declared, wealth. But the incentive to hide wealth exploded over the 20th century. In the 1950s, the top rate of estate tax was around 80%.