Three Myths About US Economic Inequality and Social Mobility

Income inequality has increased dramatically in the United States since the 1970s. However, we argue in this paper that many common perceptions about causes and consequences of rising inequality are misleading or even false. Using first-hand empirical analyses and meta-analyses of previously published work, we present and demystify three key facts about the rise in US inequality that have been given too little attention in recent debates. First, inequality has risen throughout the distribution. Post-tax and transfer income levels have grown in the middle and bottom of the distribution, not the top alone – the top 1% does not take all. Second, the trend in intergenerational social mobility has remained largely stable over the last four decades. The relative gap in mobility opportunities between children from poor and rich families has barely changed – the “Great Gatsby curve,” which predicts a general negative relationship between income inequality and intergenerational mobility, does not apply to the US. Third, changes in the return to human capital caused by shifts in the supply and demand for educated and skilled labor have played a crucial role in the rise in income inequality since the 1970s – rising corporate concentration and employer market power (monopsony) do not appear to be a key culprit