MITT ROMNEY is not the first multi-millionaire to seek the presidency, nor the richest. Ross Perot, the record-holder, spent some of his billions earned from computer data on losing bids in 1992 and 1996. Since then men who owe their or their family’s fortunes to oil, sport, publishing, trial law, ketchup, beer and bestselling autobiographies have followed.

But Mr Romney, who earned his $200m or so as a private-equity executive buying and selling companies, is the first candidate from the world of high-octane finance. As such, he illustrates the changing complexion of America’s rich. The wealthiest 1% of Americans not only get more of the pie (see chart); they are increasingly creatures of finance.

The average household income of the 1% was $1.2m in 2008, according to federal tax data. The ultra-rich skew that average upwards: admission to the 1% began at $380,000 in 2008. The Congressional Budget Office puts the cut-off lower, at $347,000 in 2007, or $252,000 after subtracting federal taxes and adding back transfers. Measured by net worth, rather than income, the top 1% started at $6.9m in 2009, according to the Federal Reserve, down 23% from 2007.

The richest 1% earn roughly half their income from wages and salaries, a quarter from self-employment and business income, and the remainder from interest, dividends, capital gains and rent. According to an analysis of tax returns by Jon Bakija of Williams College and two others, 16% of the top 1% were in medical professions and 8% were lawyers: shares that have changed little between 1979 and 2005, the latest year the authors examined (see chart). The most striking shift has been the growth of financial occupations, from just under 8% of the wealthy in 1979 to 13.9% in 2005. Their representation within the top 0.1% is even more pronounced: 18%, up from 11% in 1979.

Steve Kaplan of the University of Chicago thinks finance explains much of the rise in inequality. Updating a series developed by Thomas Piketty and Emmanuel Saez, Mr Kaplan notes that the share of income going to the 1% reached an 80-year high of 23.5% in 2007, only to sink to 17.6% in 2009 as the financial markets deflated (see chart). The trend is even more pronounced for the top 0.1%, whose share of total income rose to 12.3% in 2007 but sank to a still disproportionate 8.1% in 2009.

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