Gabriel Zucman on Inequality, Growth, and Distributional National Accounts
What this covers
Gabriel Zucman of UC Berkeley joins Russ Roberts to discuss his research on income inequality in the United States since 1980, using Distributional National Accounts—a method that allocates the entirety of National Income across the population. Zucman's central finding is stark: the bottom 50% of Americans experienced zero pre-tax income growth over 35 years while average incomes rose 60% and the top 1% tripled their real income. The conversation tests this claim against various objections—from cross-sectional measurement issues like Composition Effect to the expansion of affordable goods and consumer access since 1980—and explores whether the method's adding-up discipline strengthens or constrains the argument.
The discussion ranges across explanations for this divergence. Zucman argues U.S. policy choices, not globalization or technology, are the culprit, pointing to comparisons with peer economies: France and Scandinavian countries faced identical global forces yet allowed their bottom 50% to keep pace with growth. Within the U.S., he identifies the fall in marginal tax rates, the erosion of union bargaining power, decline of the real minimum wage, and extreme inequality in college access. Since 2000, the top 1% gains stem from capital income rather than wages—a Wealth Accumulation Feedback Loop where high earners save at high rates, compounding returns. Roberts raises counterarguments grounded in Superstar Economics and the scope for genuine market rewards in an entrepreneurial, globalized economy, while acknowledging that Monopsony Power in labor markets and policy-driven distortions like those on Wall Street warrant concern. The pair also examines longitudinal alternatives to the cross-sectional view, including evidence from tax-return tracking studies that show significant gains for those followed over time.
Zucman argues that distributional national accounts—allocating all of national income across the population—show the bottom 50% of Americans experienced zero pre-tax income growth since 1980 while the top 1% tripled, and that this divergence stems from U.S. policy choices rather than globalization or technology, since peer countries facing the same global forces avoided it.
- Allocating 100% of national income (not just taxable income) is what reconciles inequality measures with macroeconomic growth.
- France and Scandinavia faced the same globalization and technology trends but their bottom 50% kept pace with growth, implicating U.S. policy.
- Since 2000 the rise of the top 1% is driven by capital income, not labor income, pointing to wealth accumulation dynamics.
Policy choices—tax cuts, union decline, minimum wage erosion, education access inequality—not globalization explain U.S. bottom-50% stagnation.
- Growing market concentration and rising monopsony power in U.S. labor markets mean wages can diverge from the marginal product of labor, determined instead by intra-firm bargaining, union power, and policy—undermining the Econ 101 assumption of perfectly competitive markets and explaining part of the U.S.-Europe wage-inequality divergence where European salaries are often set by rigid scales.
“as soon as you on[?] it in the Econ 101, perfectly competitive, perfect-information markets, you know, pay can be different than the Marginal Product of Labor. It can be higher; it can be lower”
- There is a strong cross-country correlation between unionization and lower income inequality: economies where the middle class does well today—Germany, Scandinavia—have powerful, board-level unions and faced the same globalization and technology trends as the U.S., yet distributed growth far more equitably, suggesting policy and institutions rather than global forces drive the difference.
“there is a pretty strong correlation between unionization and income inequality. So, you look at the countries that, where the middle class is doing well these days. Germany, Scandinavian countries: These are economies where unions have power.”
- Immigration cannot explain U.S. bottom-50% stagnation because in the 2000-2009 period eleven developed countries—including France, Germany, and Scandinavian countries—had higher immigration than the United States yet did not experience the bottom-50% income stagnation seen in the U.S.
“there was actually more immigration in the EU than in the United States... where immigration was much higher than in the United States. And yet, we don't see the type of stagnation involving 50% incomes that we observe in the United States.”
- The stagnation of bottom-50% incomes in the U.S. is best explained not by low-skill immigration but by policy changes: the decline in the real federal minimum wage since the late 1960s-70s, the decline in unions and the bargaining power of labor, and very unequal access to higher education.
“The decline in the real Federal minimum wage since the late 1960s or 1970s. The decline in the role of unions. More broadly speaking, the decline in the bargaining power of labor. Very unequal access to higher education.”
- In the United States the probability of attending college is almost perfectly predicted by parents' rank in the income distribution—near 100% for children of the top 1% and close to zero for the bottom 1%—an extreme inequality of access that Zucman finds shocking, with tuition fees blocking working-class access to four-year colleges.
“If your parents are in the top 1%, you have 100% chance to attend college. If your parents are in the bottom 1%, it's not like you have zero probability... but it's close to zero. It's not 10%.”
Bottom 50% incomes stagnated completely since 1980 while top 1% tripled, with no growth even within age cohorts.
- Since 1980, while average U.S. income per adult rose about 60% in real terms, the bottom 50% of the income distribution experienced zero pre-tax, pre-transfer income growth, meaning half the population was completely shut out of economic growth even as the top 1% tripled their real income.
“if you look at income growth for the bottom 50% of the distribution, before taxes and transfers--so, before any form of government intervention--you've had zero growth for the bottom 50%”
- Rising inequality in the United States is concentrated in the top 1%, top 0.1%, and top 0.001%—where growth runs 3-5% per year—rather than a story of the top quintile pulling away; the bottom 88% of the population saw income grow less than the 1.4% average annual rate.
“We find that rising inequality in the United States is really very much a story about the top 1%.”
- When income distributions are computed by age group (20-30, 30-40, 40-50), the bottom 50% shows essentially no growth within each age band, suggesting that even following people over the life cycle would reveal little income growth, because there is strong persistence in income rank and little mobility in or out of the bottom 50% as shown in Social Security data.
“when you do that, you see, basically, no growth for the bottom 50% within each age group”
- After accounting for all federal, state, and local taxes and all monetary, in-kind, and public-goods transfers, the bottom 50% saw their income grow only about 20% since 1980—still far below the 60% average—so government redistribution, despite the expansion of Medicare and Medicaid, has not been enough to significantly lift working-class incomes.
“after taxes and transfers its income has grown a little bit. It has increased by about 20% since 1980. That is still much, much less than the average growth of 60%”
Top 1% income surge is a uniquely American phenomenon driven since 2000 by capital accumulation, not labor income.
- The rise in the top 1% income share is a uniquely American phenomenon among rich countries—not seen in Continental Europe or Canada, and only weakly in the UK—with the U.S. top 1% share rising from about 10% of pre-tax income in 1980 to roughly 20% today, while the bottom 50% share fell from 20% to about 12%, a divergence with no parallel in any other developed country since 1980.
“the rise in the top 1% income share among rich countries is actually a uniquely American phenomenon. It is not something that you see in Continental Europe. It is not something that you see in Canada.”
- Since 2000, all of the rise in the top 1% income share owes to capital income (dividends, corporate profits, interest) rather than labor income, reversing the 1980s-90s pattern that was driven by surging executive pay; the mechanism is that high labor incomes were saved at high rates, accumulating wealth that generates returns that are themselves saved, compounding capital-income concentration.
“All of the rise of the top 1% income share since 2000 owes to an increase in capital income, in the dividend income, corporate profits, interest that high-income earners get.”
- The fall in the top marginal income tax rate from 90% in the 1960s to roughly the mid-20s after the 1986 Tax Reform Act created incentives for top earners to extract very high salaries; because macroeconomic growth was not unusually high since 1980 while top incomes boomed, one reading is that high earners gained at the expense of other stakeholders (shareholders and other workers) rather than by producing proportionally more.
“There is absolutely no incentive to try to earn $50 million dollars in income, when out of any extra dollar that you earn, 90 cents are going to go to the IRS... Of course, when you face a top marginal income tax rate of 20% or 30%, now it becomes valuable to try to earn very high incomes.”
U.S. tax system is nearly flat at 30% across income distribution, reversing 1960s progressivity, while redistribution fails to offset stagnation.
- Counting all taxes at all levels of government, the U.S. tax system is barely progressive—close to a flat tax where almost everyone pays about 30% of income—because the top 1% average rate is only slightly above the 30% macroeconomic average while the bottom 50% is only slightly below, a major change from the 1960s-70s when the system was much more progressive and bottom-50% taxes have risen substantially due to payroll taxes.
“all together, the tax system in the United States is barely progressive. It's close to a flat tax where everybody almost pays 30% of their income.”
- About two-thirds of macroeconomic capital income—including corporate retained earnings, imputed rents for homeowners, the corporate and property taxes, and dividends and interest paid to pension funds—is tax-exempt and invisible in tax and survey data, which paradoxically means tax data alone do a poor job of studying the rich since capital income is highly concentrated at the top.
“About two-thirds of this macroeconomic flow of capital income, you don't see it in tax and survey data.”
Distributional national accounts method reliably measures inequality by reconciling macro growth with tax and survey data across population fractiles.
- The distributional national accounts method bridges the gap between macroeconomic study (which uses National Accounts) and inequality study (which uses tax and survey data) by combining all three sources so that growth statistics for each fractile add up to headline GDP/National Income growth, allocating total national income to population groups.
“What we're trying to do is to bridge the gap between the study of macroeconomic growth, where people use National Accounts data, and the study of inequality, where people use tax data and survey data”
- Using the National Income Price Deflator rather than the CPI addresses the standard criticism that inflation is overstated—the deflator accounts for substitution bias and shows less inflation than CPI—so the modest 1.4% annual real growth figure already incorporates a conservative inflation correction.
“It's the National Income Price Deflator... it's the price index that's used to compute real macroeconomic growth. And it shows less inflation than the CPI.”
- Consumption and income can diverge when saving rates change, and in the decade before the Great Recession the bottom 90% of the wealth distribution had a negative saving rate—consuming more than their income via skyrocketing household debt—which helps reconcile observed consumption increases with stagnant incomes.
“in the 10 years before the Great Recession, the saving rate of the bottom 90% of the wealth distribution... was actually negative. Okay? So, they were consuming more than their income.”
- Because rising inequality trends in the U.S. are so massive and already visible in survey and tax data, varying the imputation methods for hard-to-observe income categories like capital income does not materially change the headline results.
“the research don't change much for the simple reason that the rising inequality in the United States--the trends are so massive that even small deviations--you know, changing imputations from some capital reserve income doesn't affect these big trends”
- Because the distributional accounts must add up to total National Income, claims that bottom incomes grew a lot are logically constrained: if the bottom grew more, the top must have grown much less than estimated, which is contradicted by overwhelming evidence on top incomes—so the adding-up discipline is what gives the method its bite.
“if you believe that income has grown a lot at the bottom of the distribution, it has to be the case that it has grown a lot less at the top of the distribution than what we estimate. That's contradicted by a huge and overwhelmingly large set of evidence”
- Whereas in 1980 the U.S. bottom 50% earned about 10% more than France's bottom 50%, French bottom-50% incomes have since grown at roughly the same rate as macroeconomic growth while U.S. incomes stagnated, so the French bottom half now has more market income than the American bottom half—a divergence visible before any taxes and transfers, ruling out the French welfare state as the cause.
“now, the bottom 50% in France is significantly richer--has more income--than in the United States. And that is before taxes and transfers.”