The Economist reports about a study by Annette Alstadsæter, Niels Johannesen and Gabriel Zucman who matched leaked information from Swiss banks and Panamanian shell companies with Scandinavian wealth records. Their findings:

• Tax evasion is progressive. The average / top 1% / top 0.01% Scandinavian household paid 3% / 10% / 30% fewer taxes than it should.
• Accordingly, estimates of wealth inequality (based on tax data) likely underestimate the degree of inequality.