Behind Ford's sudden leap upmarket lies a striking demographic shift. Since the 1970s, most of the income growth in the United States has gone to those who were already making the most. According to the Commerce Department, more than 8 million households have annual incomes over $100,000, and about half that number are estimated to have $1 million or more in assets. America can now lay claim to what conservative critic David Frum has aptly called "history's first mass upper class."
-James Lardner
-What is this paragraph defining?

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The Answer of Behind Ford's sudden leap upmarket lies a striking demographic shift. Since the 1970s, most of the income growth in the United States has gone to those who were already making the most. According to the Commerce Department, more than 8 million households have annual incomes over $100,000, and about half that number are estimated to have $1 million or more in assets. America can now lay claim to what conservative critic David Frum has aptly called "history's first mass upper class."
-James Lardner
-What is this paragraph defining?

Behind Ford's Sudden Leap Upmarket Lies a Striking Demographic Shift