Lots of cities have a 1-4% millionaire density. By The Economist's definitions, Frankfurt is over 7%. NYC has 400,000 millionaires (5%). http://www.economist.c

Lots of cities have a 1-4% millionaire density. By The Economist's definitions, Frankfurt is over 7%. NYC has 400,000 millionaires (5%). http://www.economist.com/blogs/graphicdetail/2013/05/daily-chart-7 http://www.economist.com/blogs/graphicdetail/2013/05/daily-c...