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The professional class, also called the upper middle class, consists mostly of highly educated white collar salaried professionals, whose work is largely self-directed. In 2005, these household incomes commonly exceed $100,000 per year.
Using the 15% figure one may conclude that the American upper middle class consists, strictly in an income sense, of professionals with personal incomes in excess of $62,500, who commonly reside in households with six figure incomes.