A U.S. Federal Reserve study calculated the mean and median incomes for 2007 for each of the different income groups represented in the table.

Why does the disparity between mean and median income get larger as income gets larger?

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entile Mean Median Income Below 20% 20 to 39.9% 40 to 59.9% 60 to 79.9% 80 to 89.9% 90 to l00% $10,520 $134,900 $209,900 $375,100 $606,300 $3,306,000 $8,100 $37,900 $88,100 $204,900 S356,200 $1.119,000