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Political Polarization and Income Inequality in the United States

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June 23, 2014
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by Rajashri Chakrabarti and Matt Mazewski – Liberty Street Economics, Federal Reserve Bank of New York

Even the most casual observer of American politics knows that today’s Republican and Democratic parties seem to disagree with one another on just about every issue under the sun. Some assume that this divide is merely an inevitable feature of a two-party system, while others reminisce about a golden era of bipartisan cooperation and hold out hope that a spirit of compromise might one day return to Washington.

In this post, we present evidence that political polarization—or the trend toward more ideologically distinct and internally homogeneous parties—is not a recent development in the United States, although it has reached unprecedented levels in the last several years. We also show that polarization is strongly correlated with the extent of income inequality, but only weakly associated with the rate of economic growth. We offer several tentative explanations for these relationships, and discuss whether all forms of polarization are created equal.

To measure polarization, we make use of DW-NOMINATE (dynamic weighted nominal three-step estimation), an algorithm developed by political scientists Keith Poole of the University of Georgia, Howard Rosenthal of New York University, and Nolan McCarty of Princeton University. DW-NOMINATE uses roll call voting records to measure the underlying ideological preferences of legislators and groups legislators along two dimensions. The first can be characterized as representing the left-right divide over economic or fiscal issues, while the second captures views on regional or other cross-cutting issues (such as slavery in the mid-1800s or bimetallism later in the nineteenth century). The algorithm’s creators point out that most of the variation in roll call behavior, especially in recent years, can be accounted for by variation along the first dimension alone. Following their lead, we work with only the one-dimensional DW-NOMINATE scores. Scores run from -1 to 1, with negative values taken to indicate liberal views and positive values taken to indicate conservative views.

The chart below shows the mean DW-NOMINATE scores for Republican and Democratic members of the U.S. House of Representatives from 1857 to 2012. (Scores are computed at the end of each two-year congressional term.) The difference between these two lines can be interpreted as a measure of polarization, since it shows roughly how far apart the average House Republican and Democrat are ideologically. A similar pattern holds for the Senate (not shown), although the extent of polarization has been greater in the lower chamber.

Chart 1 shows mean DW-NOMINATE scores in the House, 1857-2012

The next chart shows that polarization is hardly a recent phenomenon—the difference in mean DW-NOMINATE scores has been increasing since at least the 1970s and is now at an historic high. The widening gap between the parties also appears to be due more to the average House Republican becoming more conservative than to the average House Democrat becoming more liberal, a phenomenon termed “asymmetric polarization.”

Chart 2 shows difference in mean DW-NOMINATE scores in the House, 1857-2012

We consider whether polarization is associated with economic growth, since it stands to reason that the failure of the two major parties to forge agreements on domestic policy issues could cause economic performance to falter or that poor economic performance could lead to the empowerment of extreme political factions and an increase in polarization. The next chart plots real GDP growth against the difference in mean DW-NOMINATE scores in the House for the period 1931-2012. (Although not shown, the patterns for the Senate are similar.)

We see no clear relationship between the two series. The correlation coefficient is -0.19, suggesting that the association between growth and polarization is relatively weak.

Chart 3 shows mean DW-NOMINATE difference for House versus real GDP Growth, 1931-201

Next we explore the relationship between polarization and income inequality. We present a chart plotting the share of income accruing to the top 1 percent of earners against the difference in mean DW-NOMINATE scores between House Republicans and Democrats. The two series follow strikingly similar trajectories, although it appears that a shift in the polarization measure consistently leads the inequality measure by several years.

Chart 4 shows mean DW-NOMINATE difference for House versus top 1% income share, 1913-2012

The correlation coefficients between the two series are 0.68 for the House and 0.39 for the Senate. Since it looks as if polarization actually precedes inequality by several years, we also look at the correlations between the top income share and lagged polarization. The correlations for polarization lagged five years are 0.82 and 0.56, respectively, and for polarization lagged ten years are 0.91 and 0.72, respectively. This associative relationship continues to hold if we instead look at other inequality measures, like the Gini coefficient or the share of income accruing to the top 10 percent of earners.

Some commentators have opined that the relative ideological distance between the parties might not matter as much vis-à-vis economic outcomes as does the ideological “center of gravity” of policy debates. In light of the evidence for asymmetric polarization, it might be reasonable to suppose that income inequality would follow different paths depending on whether the lion’s share of polarization is attributable to the party that supports increased income redistribution via tax and transfer programs or to the one that favors less government involvement in the economy. In other words, polarization per se may not be as important as the specific way in which polarization unfolds.

To that end, we examine separately the relationship between the income share of the top 1 percent and the mean DW-NOMINATE scores of both party caucuses in each chamber. We find that top income shares are more highly correlated with mean Republican DW-NOMINATE scores in both chambers than with the difference in mean scores, and that Democratic ideology in the Senate is almost totally uncorrelated with inequality. We get similar results when we use the Gini coefficient as the inequality measure.

One possible mechanism by which polarization could affect inequality involves the notion of “policy drift.” That occurs when policies remain in effect despite being outdated or ill-suited to changing circumstances because of political stalemate. For example, many policies are indexed to inflation, but others are not. The ones that are tend to be those that benefit high earners (such as income tax structure) and those that aren’t tend to benefit individuals at the lower tail of the income distribution (such as the federal minimum wage). In a policy-drift story, polarization affects inequality because it contributes to legislative gridlock, which in turn prevents safety nets or tax policy from evolving to handle new challenges.

Another possible channel by which polarization might drive inequality involves financial regulation. Asymmetric polarization associated with a shift of the political center of gravity to the right can lead to lighter regulation of finance, which in turn may lead to rising incomes for individuals in the upper tail of the income distribution.

The subject of income inequality has gotten a great deal of attention in the media over the past several months, and polarization and gridlock have been features of the American political landscape for years. We can confirm that polarization has increased over the past thirty-five to forty years, and that it has done so in an asymmetric way, with Republicans moving further from the center than Democrats. And while we find that polarization is only weakly associated with growth, we find a robust association between a widening ideological gap and income inequality.

Disclaimer

The views expressed in this post are those of the authors and do not necessarily reflect the position of the Federal Reserve Bank of New York or the Federal Reserve System. Any errors or omissions are the responsibility of the authors.

Source: http://libertystreeteconomics.newyorkfed.org/2014/06/the-capitol-since-the-nineteenth-century.html#.U6gXa_ldVio


About the Authors

Chakrabarti_rajashriRajashri Chakrabarti is a senior economist in the Federal Reserve Bank of New York’s Research and Statistics Group.

Mazewski_mattMatt Mazewski is a research analyst in the Group.

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