“…challenges misconceptions that distort our economic debates.” - Arthur Brooks, President of the American Enterprise Institute
“…reminds us that inequality sends a signal of what society lacks most, in America’s case, entrepreneurship and risk taking.” - Lawrence Lindsey, CEO, The Lindsey Group, former Director of the National Economic Council
“…a fresh argument for the productive value of inequality.” - David Autor, Professor of Economics, Massachusetts Institute of Technology
“…a comprehensive explanation of the modern economy.” - Julian Robertson, Founder, Tiger Management
“…a must-read for serious students of economic policy.” - Glenn Hubbard, Dean, Columbia Business School, and former Chairman of the Council of Economic Advisers
“…a comprehensive explanation of the modern economy.” - Julian Robertson, Founder, Tiger Management
“Unintended Consequences is full of substance, it is one of the must-read books of the year, and once I finish it I will be giving it a second read through right away.” - Tyler Cowen, Professor, George Mason University
“Unintended Consequences provides a provocative interpretation of the causes of the global financial crisis and the policies needed to return to rapid growth. Whether you agree or not, this analysis is well worth reading.” - Nouriel Roubini, New York University; Chairman, Roubini Global Economics
“…a very valuable contribution.” - Larry Summers, former Secretary of the Treasury and director of the National Economic Council, president emeritus, Harvard University
“There are an amazing number of good ideas and interesting points made in Unintended Consequences. The thinking underlying it, and the obvious depth of understanding of the author, are very impressive.” - Steven Levitt, coauthor of Freakonomics; 2004 John Bates Clark Medal
“…serious thinking for serious thinkers. …a thought-provoking blueprint for growing middle- and working-class incomes.” - Mitt Romney, former Governor of Massachusetts
“…challenges misconceptions that distort our economic debates.” - Arthur Brooks, President of the American Enterprise Institute
AI Summary.The surge of baby boomers, women, and immigrants entering the US labor force between 1960 and 1980 was difficult for the economy to absorb, and young workers' wages fell sharply after peaking in the early 1970s. The author argues those entrants kept occupying jobs and suppressing demand for new workers until retirement.
Steven RugglesProceedings of the National Academy of Sciences
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Accounting for both inflows and the overhang of previous labor market entrants, Ruggles predicts a labor shortage such that “Americans born in the 2020s might be the first cohort in a half century that earns significantly more than their parents did.”
How does a large influx of workers affect young workers' wages?
Core argument: Wages for young U.S. workers declined sharply after peaking in 1973, as the economy struggled to absorb the influx of workers entering the labor force between 1960 and 1980 from the baby-boom cohort, rising female participation, and increased immigration.
Figure 3A highlights the influx of workers that occurred between 1960 and 1980, as the large baby-boom cohort entered the labor force, female labor-force participation expanded, and immigration rose [see Figure 2 for a detailed breakdown]. It was difficult for the economy to absorb all the new workers, and wages for young people declined sharply after peaking in 1973. Figure 3A does not, however, provide a valid measure of labor-market competition because the baby boomers and newly employed women and immigrants did not suddenly vanish after they entered the labor force; they kept working and occupying jobs until they eventually retired decades later. The glut of workers entering the labor force in the 1970s would continue to stifle demand for new workers until their eventual exit from the labor force, a process that is still in progress. The index of employment competition shown in Figure 3B is [a better] measure of relative cohort size than 3A. It represents the cumulative net labor-market entries over the previous five decades as a % of the working-age population in the current decade. As shown in Figure 1C, we are already seeing signs of an uptick in the wages of young workers, and as the demographic shortage accelerates we may finally see real wages of the young exceed the levels of the early 1970s.
Takeaways by Macro Roundup® AI
Wages for young U.S. workers declined sharply after peaking in 1973, as the economy struggled to absorb the influx of workers entering the labor force between 1960 and 1980 from the baby-boom cohort, rising female participation, and increased immigration.
Decennial labor-force entries alone misstate labor-market competition, because baby boomers, newly employed women, and immigrants kept occupying jobs and stifling demand for new workers until their retirements, a process still in progress.
An index of employment competition measuring cumulative net labor-market entries over the previous five decades as a percentage of the current decade's working-age population is offered as a better gauge of relative cohort size, with young workers' wages already showing an uptick.
Related Articles:
Baby Busts and Growth Booms: Demographic Change and the Macroeconomy— A 1pp lower birth rate 20 years earlier is associated with 22 log points higher output per worker 20 years later and 29 log points higher after 40 years, about 0.73pp faster annual growth. The authors find lower birth rates are also associated with more labor-saving patents, larger high-tech shares, and higher productivity growth.
Technology and the Baby Bust Paradox— Aging populations create structural incentives to automate, and the argument is that demographic change could become one of the strongest long-run drivers of artificial intelligence deployment. Technology-producing economies may benefit twice, offsetting their own labor shortages while exporting automation, robotics, and AI to other aging societies.
Can A Depopulating America Still Flourish?— US labor force participation among women aged 25-54 has reached all-time highs, exceeding its previous 1999 peak, yet remains over 4 points below Europe's level and nearly 6 points below Japan's. About 3.5m prime-age American women are neither working nor looking for work, without children at home or husbands, compared with roughly 7m such men.
AI Summary.Across 22 countries, the gap between women's and men's daily hours of housework and caregiving is strongly correlated with lower total fertility rates. Countries that modernized rapidly show larger gender gaps in home work and lower fertility than those with more continuous economic growth since 1920.
Claudia GoldinNational Bureau of Economic Research
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Goldin puts forth a “mismatch” theory of low fertility in countries that moved from stagnation to rapid growth such as Japan and southern Europe. “These countries have an excess number of unpaid hours worked by women. They also have lower birth rates.”
Do larger gender gaps in housework correspond with lower fertility?
Core argument: Across 22 nations, the correlation between total fertility rate and the gender difference in household and care hours is strong, with larger female excess burdens at home accompanying lower fertility.
Group 1 nations had fairly steady increases in economic growth across the long period from 1920 to 2022. Group 2 nations did not. Men in these currently developed countries that modernized rapidly do considerably less housework and care for others in their homes, relative to women, than do men in countries that had more continuous growth experiences. That fact can be seen in Figure 12, which provides data for 22 nations on women’s excess burdens at home. On the horizontal axis is the difference in household and care hours per day done by the average woman minus that done by the average man. On the vertical axis is the total fertility rate. All six Group 1 nations are in the upper left of Figure 12, with higher fertility and lower time differences between the genders. All six Group 2 nations are in the lower right, with lower fertility and higher time differences between the genders. The difference in hours of house- and care-work for Japan, for example, is 3.1 hours and is 3 hours for Italy. Their TFRs (in 2019) were 1.36 and 1.27 respectively. But the hours difference was 0.8 for Sweden and 0.9 for Denmark. Their TFRs (in 2019) were both 1.7. The correlation between the country’s TFR and the gender difference in household and caring hours is strong.
Takeaways by Macro Roundup® AI
Across 22 nations, the correlation between total fertility rate and the gender difference in household and care hours is strong, with larger female excess burdens at home accompanying lower fertility.
Japan and Italy show gender gaps of 3.1 and 3 hours per day in house- and care-work with 2019 total fertility rates of 1.36 and 1.27, while Sweden and Denmark show gaps of 0.8 and 0.9 hours with rates of 1.7 each.
The six Group 1 nations, with fairly steady economic growth from 1920 to 2022, cluster at higher fertility and smaller gender time differences, while the six rapidly modernizing Group 2 nations cluster at lower fertility and larger differences.
Related Articles:
The Downside of Fertility— In developed countries that modernized very rapidly, men do considerably less housework and care for others at home relative to women than in countries with more continuous growth. Larger gender gaps in household and caring hours are strongly correlated with lower fertility rates across these countries.
The Demographic Future of Humanity: Facts and Consequences— The authors estimate the world total fertility rate is around 2.17, below the global replacement rate of roughly 2.21, meaning humanity is already below replacement, with fertility and births falling faster than anticipated. They project middle-income countries' fertility may fall below that of rich countries outside East Asia, with emigration compounding population decline.
Babies and the Macroeconomy— Fertility rates have fallen in nearly every country, but timing differed: some developed nations fell below the 2.1 replacement level as early as the 1970s, while others dropped to "lowest low" levels below 1.3. The author argues nations with rapid, discontinuous growth saw sharper declines as women's expectations outpaced tradition-bound men's willingness to share family time.
AI Summary.As labor force participation falls, a shrinking group of workers generates the income, taxes, and innovation supporting a growing number of non-workers, leaving the economy more fragile because labor shocks are concentrated among fewer participants. Labor scarcity raises the return on automation, robotics, and software, making growth depend on productivity rather than participation.
Paul KedroskyApplied Complexity
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Overall LFP is at a 50-year low. Kedrosky warns, “As fewer adults work or seek work, a larger fraction of voters experience the economy mostly as consumers, retirees, or rentiers, not as workers…[which] changes incentives around….taxation and redistribution.”
How does falling labor force participation reshape growth and fragility?
Core argument: Falling labor force participation leaves a shrinking core of workers generating the income, taxes, and innovation that support a growing number of non-workers, and makes the economy more fragile because labor shocks are concentrated among fewer participants.
As fewer adults work or seek work, a larger fraction of voters experience the economy mostly as consumers, retirees, or rentiers, not as workers. That changes political incentives around wages, immigration, AI, taxation, and redistribution. The economy becomes increasingly dependent on a shrinking core. A shrinking group of workers generates the income, taxes, and innovation that support a growing number of non-workers. The economy becomes more fragile because labor shocks are concentrated among fewer participants. Capital must increasingly substitute for labor. Labor scarcity raises the return on automation, AI, robotics, and software. The AI bet becomes as much about compensating for workers' absence as simple replacement. Growth increasingly depends on productivity, on not participation. Any [productivity] miss will be much more consequential than in the past, given that labor no longer picks up the slack.
Takeaways by Macro Roundup® AI
Falling labor force participation leaves a shrinking core of workers generating the income, taxes, and innovation that support a growing number of non-workers, and makes the economy more fragile because labor shocks are concentrated among fewer participants.
As more voters experience the economy as consumers, retirees, or rentiers rather than workers, political incentives shift around wages, immigration, AI, taxation, and redistribution.
Labor scarcity raises the return on automation, AI, robotics, and software, making the AI bet as much about compensating for workers' absence as replacing them, with growth depending on productivity rather than participation and any productivity miss more consequential than in the past.
Related Articles:
Baby Busts and Growth Booms: Demographic Change and the Macroeconomy— A 1pp lower birth rate 20 years earlier is associated with 22 log points higher output per worker 20 years later and 29 log points higher after 40 years, about 0.73pp faster annual growth. The authors find lower birth rates are also associated with more labor-saving patents, larger high-tech shares, and higher productivity growth.
Have We Entered an Era of High Productivity Growth?— Labor productivity has grown solidly while the San Francisco Federal Reserve's total factor productivity index, which adjusts for the equipment and technology workers use, has grown modestly, suggesting gains so far reflect better tools rather than broader advances. A regime-switching model puts the probability of a high-productivity regime at 57% using labor productivity and 21% using total factor productivity.
The Budget and Economic Outlook: 2026 to 2036— The Congressional Budget Office projects the federal deficit will grow from $1.9tn (5.8% of GDP) to $3.1tn (6.7%) over a decade, above the 3.8% averaged over the past 50 years, with rising net interest costs driving much of the increase. Federal debt held by the public is projected to rise from 101% to 120% of GDP.
AI Summary.A 1pp lower birth rate 20 years earlier is associated with 22 log points higher output per worker 20 years later and 29 log points higher after 40 years, about 0.73pp faster annual growth. The authors find lower birth rates are also associated with more labor-saving patents, larger high-tech shares, and higher productivity growth.
Daron Acemoglu, David Autor, Keelan Beirne and Andrew ScottNational Bureau of Economic Research
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Cross-country evidence from 1950 to 2020 shows that a 1pp lower birth rate is associated with 22 log points (~25%) higher GDP per worker 40 years later and 29 log points (~44%) after 60 years, likely driven by labor-saving technical change.
Do lower birth rates raise output per worker decades later?
Core argument: A 1pp lower birth rate 20 years earlier is associated with 22 log points higher GDP per worker at t+20 and 29 log points by t+40, roughly 0.73 percentage points faster annual growth over the 40-year interval.
Figure 3 traces out how GDP per worker evolves following a 1pp increase in birth rates at t−20. Since cohorts born at t−20 (e.g., 1970) do not enter the working-age population until t = 0 (e.g., 1990), we should observe no response before t = 0; [indeed] the estimated coefficients are ~0 and statistically insignificant before t = 0. Beginning at t = 0, however, higher birth rates are associated with lower GDP per worker, and the negative effects grow progressively larger over time. For example, a 1pp lower birth rate at t−20 is associated with 22 log points higher GDP per worker at t+20 and 29 log points higher by t+40. The latter corresponds to roughly 0.73 percentage points faster annual growth over the 40-year interval. We find that lower birth rates are associated with more labor-saving patents and a growing share of high-tech industries across countries and US commuting zones [Figure 11]. They are also predictive of higher TFP growth across countries and US industries and increased patenting in ICT and broader automation technology classes. Using cross-country variation in WWII-era military and civilian deaths, we present suggestive evidence that the positive growth effects of falling birth rates are primarily driven by the scarcity of younger workers rather than by reductions in population per se [Figure 14]. [Editor’s note: the paper does not grapple with the fiscal consequences of an aging population.]
Takeaways by Macro Roundup® AI
A 1pp lower birth rate 20 years earlier is associated with 22 log points higher GDP per worker at t+20 and 29 log points by t+40, roughly 0.73 percentage points faster annual growth over the 40-year interval.
Estimated coefficients for GDP per worker are near zero and statistically insignificant before affected cohorts enter the working-age population at t = 0.
Lower birth rates are associated with more labor-saving patents, a growing high-tech industry share across countries and US commuting zones, higher TFP growth, and more ICT and automation patenting, with WWII-era death variation offering suggestive evidence that scarcity of younger workers, rather than smaller population, drives the growth effects.
Related Articles:
Can A Depopulating America Still Flourish?— US labor force participation among women aged 25-54 has reached all-time highs, exceeding its previous 1999 peak, yet remains over 4 points below Europe's level and nearly 6 points below Japan's. About 3.5m prime-age American women are neither working nor looking for work, without children at home or husbands, compared with roughly 7m such men.
Capital Is Making a Comeback— Tangible investment in property, factories and equipment fell from 12.5% to 8.5% of private gross domestic product, while intangible investment in intellectual property, software and process knowledge rose from about 11.5% to 16.75%. The author argues demand for tangible capital investment will now have to rise.
America Is Missing The New Labor Economy – Robotics Part 1— Building an identical robotic arm in the US costs about 2.2x more than in China, and US-labeled components still depend heavily on Chinese parts and materials with no scalable alternative. The author argues China is the only country positioned to capture full-scale intelligent robotic automation, which would let it outcompete the US across production.
