Gottschalk, Peter; Moffitt, Robert - In: Journal of Economic Perspectives 23 (2009) 4, pp. 3-24
The inequality of earnings and of family incomes in the United States has increased since the late 1970s. The large rise in earnings inequality between the 1970s and the 1990s could reflect either a rise in disparity of permanent incomes, a rise in earnings instability, or some portion of both....