Hollowing Out: The Channels of Income Polarization in the United States

Data show that middle-income households have continued moving down, and less so up, the income distribution in the United States since the 1970s—a phenomenon that is often referred to as the polarization or “hollowing out” of the income distribution. While the level of income polarization is general...

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Bibliographic Details
Main Author: Alichi, Ali
Other Authors: Mariscal, Rodrigo, Muhaj, Daniela
Format: eBook
Language:English
Published: Washington, D.C. International Monetary Fund 2017
Series:IMF Working Papers
Subjects:
Online Access:
Collection: International Monetary Fund - Collection details see MPG.ReNa
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651 4 |a United States 
653 |a Population & demography 
653 |a Wealth 
653 |a Income 
653 |a Demographic Economics: General 
653 |a Income distribution 
653 |a Saving 
653 |a Personal income 
653 |a Aggregate Factor Income Distribution 
653 |a Personal Income, Wealth, and Their Distributions 
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653 |a Population and demographics 
653 |a Demography 
653 |a Education: General 
653 |a Population 
653 |a Macroeconomics 
653 |a Macroeconomics: Consumption 
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520 |a Data show that middle-income households have continued moving down, and less so up, the income distribution in the United States since the 1970s—a phenomenon that is often referred to as the polarization or “hollowing out” of the income distribution. While the level of income polarization is generally lower in the richer states (i.e., those with higher median household income levels), there have been wide variations in the changes in income polarization over time across states. The paper develops two indices to measure income polarization including a novel hollowing-out index. Another important contribution of the paper is to examine the proximate causes of income polarization. The econometric analysis is done at both state and household levels. The results suggest that technology, measured by job routinization, and international trade, measured by job offshoring, can fully explain the non-trend rise in income polarization, with broadly equal contributions. Household characteristics, including age, education, race, and gender have also been important drivers but with a net countervailing effect on income polarization. This is mainly thanks to the rising education level of households, which has led to better incomes