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<p>Thomas Piketty’s <i>Capital in the Twenty-First Century</i> puts forth a logically consistent explanation for changes in income and wealth inequality patterns. However, while rich in data, the book provides no formal empirical testing for its theorized causal chain. This paper tests the hypothesis that the <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11127_2025_1283_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="41" /> </InlineMediaObject> <EquationSource Format="TEX">\(r-g\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>r</mi> <mo>-</mo> <mi>g</mi> </mrow> </math></EquationSource> </InlineEquation> gap drives income inequality and the increasing capital share of national income. Using panel VAR models with data from 18 advanced economies over 30 years, I find no empirical support for Piketty’s predictions. The results suggest that dynamics such as savings-rate adjustments and diminishing returns to capital play critical roles in offsetting the hypothesized effects. These findings challenge the theoretical underpinnings of the growth in inequality and call for alternative explanations.</p>

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Testing Piketty’s hypothesis on the drivers of income inequality: evidence from panel VARs with heterogeneous dynamics

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Carlos Góes

摘要

Thomas Piketty’s Capital in the Twenty-First Century puts forth a logically consistent explanation for changes in income and wealth inequality patterns. However, while rich in data, the book provides no formal empirical testing for its theorized causal chain. This paper tests the hypothesis that the \(r-g\) r - g gap drives income inequality and the increasing capital share of national income. Using panel VAR models with data from 18 advanced economies over 30 years, I find no empirical support for Piketty’s predictions. The results suggest that dynamics such as savings-rate adjustments and diminishing returns to capital play critical roles in offsetting the hypothesized effects. These findings challenge the theoretical underpinnings of the growth in inequality and call for alternative explanations.