“Unintended Consequences should be read by anyone who takes for granted the superiority of progressive taxation and has not thought carefully about the trade-offs involved.” - The New Republic
“…a fresh argument for the productive value of inequality.” - David Autor, Professor of Economics, Massachusetts Institute of Technology
“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
“…a must-read for serious students of economic policy.” - Glenn Hubbard, Dean, Columbia Business School, and former Chairman of the Council of Economic Advisers
“…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
“…a fresh argument for the productive value of inequality.” - David Autor, Professor of Economics, Massachusetts Institute of Technology
“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
“…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 full-throated defense of economic dynamism.” - The Wall Street Journal
“…a very valuable contribution.” - Larry Summers, former Secretary of the Treasury and director of the National Economic Council, president emeritus, Harvard University
“…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

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IQ Differences of Identical Twins Reared Apart Are Significantly Influenced by Educational Differences

Jared Horvath and Katie Fabricant Acta Psychologica

Date Posted:: October 28, 2025
Is Database:: Database
Is Important:: Important

“Educationally similar” monozygotic (MZ) twins raised apart [TRA] have a mean IQ delta of 5.8 points, ~ the same as those raised together. “Educationally dissimilar” MZ TRA have a delta of 12.8 points, closer to non-twin siblings than twins reared together.

We gathered data from every available TRA [Twins Raised Apart] case published in the academic literature over the last century that included both individualized IQ and biographical data. This data set (which we believe represents the entirety of the non-amalgamated TRA field; the vast majority embodied in existing studies are amalgamated) consists of 87 pairs. We split these pairs into three groups: similar, somewhat dissimilar, and very dissimilar schooling. Of the 87 pairs, 52 experienced a similar type and duration of schooling within a similar location. In fact, 25 of these pairs attended the same school for some period of time. One would be correct in questioning whether these twins truly meet the criteria of ‘reared apart;’ eyebrows should certainly be raised over how varied researchers have defined the term. Analysis revealed that ‘Educationally Similar’ TRA pairs have an ICC of 0.87 ± 0.02 (n = 52) and an absolute IQ differential of 5.8 points (SD = 6.7). This makes this group nearly indistinguishable from MZ twins reared together. Further analysis of the 35 ‘educationally dissimilar’ TRA pairs shows an ICC of 0.75 ± 0.04 (n = 32) and an absolute IQ differential of 12.8 points (SD = 7.3). The correlation is 0.12 lower than the ‘educationally similar’ TRAs and the IQ differential places this group closer in stature to non-twin siblings than MZ or even dizygotic twins reared together.

Takeaways by Macro Roundup^® AI

Among 87 twins-reared-apart pairs with individualized IQ and biographical data, the 52 with similar schooling show an intraclass correlation of 0.87 ± 0.02 and an absolute IQ gap of 5.8 points (SD = 6.7), nearly indistinguishable from identical twins reared together.
The 35 educationally dissimilar twins-reared-apart pairs show an intraclass correlation of 0.75 ± 0.04 (n = 32) and an absolute IQ differential of 12.8 points (SD = 7.3), placing them closer to non-twin siblings than to identical or fraternal twins reared together.
Of the 52 educationally similar twins-reared-apart pairs, 25 attended the same school for some period, raising the question of whether those twins meet the criteria of "reared apart" and how varied researchers' definitions of the term have been.

To Fix Education, Fix The Economy First

John Burn-Murdoch Financial Times

Date Posted:: August 7, 2026
Is Database:: Database
Is Important:: Important

Using OECD skills data and the Luxembourg Income Study, Burn-Murdoch finds US workers at the lowest levels of literacy and numeracy earn ~ on par with British workers scoring a 2, ~ a mean score.

30% of US adults have literacy skills typical of a 10-year-old. The same proportion of US workers who score stunningly low on literacy earn an average of almost $30 per hour, and two-thirds of them are in work. Their British counterparts make the equivalent of $20 and fewer than half are employed. This all looks more like the fruits of years of stronger growth than vocational education policy. We should view education as creating potential that a strong economy unleashes (and a weak one disappoints).

Takeaways by Macro Roundup^® AI

30% of US adults have literacy skills typical of a 10-year-old, yet US workers scoring that low earn an average of almost $30 per hour and two-thirds of them are employed.
British workers with similarly low literacy scores earn the equivalent of $20 per hour and fewer than half are employed, a gap the author attributes to years of stronger US growth rather than vocational education policy.
The author argues that education should be viewed as creating potential that a strong economy unleashes and a weak one disappoints.

Meritocracy and the Networks It Forged: China’s Imperial Examination

Ying Bai and Ruixue Jia National Bureau of Economic Research

Date Posted:: August 3, 2026
Is Database:: Database

From 1644–1905, Qing China staffed its bureaucracy through exams and patronage. Only 12.6% of exam graduates reached top office, but patronage favored stronger performers, illustrating how merit and connections can be complements rather than substitutes.

Figure 5 studies the interplay between merit and networks by estimating the effects of exam performance and ties to powerful examiners separately for the high- and low-performing categories. The left panel shows the effects of exam performance for the two categories, while the right panel presents those of examiner power. Two patterns stand out. First, exam performance matters more for the high category, consistent with the institutional design that steered this elite group toward more prestigious careers. Second, ties to powerful examiners are also more valuable for the high category, pointing to a complementarity between merit and networks. To understand the implications of our finding on complementarity, it is useful to contrast it with the counterfactual of substitution. When merit and networks are complements (rather than substitutes), those who attained top office tend to exhibit both stronger exam performance and stronger connections. By contrast, under substitution, strong networks would compensate for weaker exam performance, and vice versa. Complementarity implies [a higher degree of meritocracy than substitution, as] successful candidates appear to have had better performance. Second, complementarity makes it harder to identify the influence of networks: their effects can operate under the guise of merit rather than as a visible substitute for it.

Takeaways by Macro Roundup^® AI

In China's imperial examination system, exam performance mattered more for candidates in the high-performing category, consistent with an institutional design that steered that elite group toward more prestigious careers.
Ties to powerful examiners were also more valuable for the high-performing category, pointing to complementarity between merit and networks rather than substitution.
Complementarity implies a higher degree of meritocracy than substitution, since those attaining top office tended to show both stronger exam performance and stronger connections, and it makes the influence of networks harder to identify because it can operate under the guise of merit.

The Returns to Education: A Meta-Study

Gregory Clark and Christian Alexander Abildgaard Nielsen Kyklos

Date Posted:: February 11, 2026
Is Database:: Database
Is Important:: Important

Clark and Nielsen replicate the ~8% estimates of the return to education obtained by standard methods, but find evidence of selection biases in favor of high estimated returns. After correcting for these biases, they calculate returns on the order of 3%.

In this meta-study of 79 estimates of the causal effects of education on earnings (derived from increases of the mandated school-leaving age or legislation banning child labor under certain ages), we report a similar effect to [the classic] earlier study (Ashenfelter, et al): an 8.2% gain in earnings for each year of education. We also find clear evidence of significant publication biases. Studies passing the filter of publication were more likely to have coefficients statistically significantly greater than 0, and we observe strong evidence that studies with returns estimated at less than 0 were more difficult to publish. There is strong suggestive evidence of the first publication bias in the data. Figure 6 shows that the average estimated return rises substantially where the standard error is larger. This suggests a greater likelihood of an estimate being published when it was statistically significantly different from 0. If all estimates were published independent of the estimated return, we would not expect there to be such a gradient. Correcting the first publication bias by looking at the average return on the studies with the lowest standard errors would suggest an average causal return to education of no more than 3%, compared to the reported 8.2%. Independent of this, correcting for the omission of returns less than 0 implies an overall causal return to education only in the 0%–3% range.

Takeaways by Macro Roundup^® AI

A meta-study of 79 causal estimates of education's effect on earnings, drawn from school-leaving age mandates and child labor bans, reports an 8.2% earnings gain per year of education, similar to the earlier Ashenfelter et al. study.
Average estimated returns to education rise substantially where standard errors are larger, which suggests estimates were more likely to be published when statistically significantly different from 0.
Correcting for publication bias by using the studies with the lowest standard errors would suggest an average causal return to education of no more than 3%, while correcting for omitted negative estimates implies a 0%–3% range.

Marginal Admission to Elite High Schools: Long-run Effects on Labor Market Outcomes

Francisco Cabrera-Hernández, Andrew Dustan, Daniel Osuna Gomez and María Padilla-Romo National Bureau of Economic Research

Date Posted:: January 22, 2026
Is Database:: Database

In data from the Mexico City metro area over 2003–2009, students who just missed the exam score cutoff for admission to an elite high school have 5.3% higher wages after five years (2.5% after 10 years) than marginally admitted students.

[We] trace out the [harmful] causal impact of [marginal] assignment to an elite school [as opposed to just missing the admissions cutoff] on formal private labor market outcomes over time. Five years after the assignment process (at ages 19-20, beyond high school age), elite assignment [based on a test score marginally above the cutoff] causes a 3.2pp decline in the probability of ever having held a formal job. This is a 16% decline relative to the base rate of 20% for students missing the elite cutoff by one point. Over time, this elite disadvantage declines: after 10 years (at ages 24-25, after the typical age of college graduation), the effect is -2.1pp, while after 15 years (at ages 29-30) the estimated -0.2pp impact is statistically insignificant. While the negative effect on formal employment eventually fades, it leaves elite students with a deficit in formal labor market experience. After 5 years, elite assignment reduces the cumulative number of months with a formal job by 14%. Conditional on formal employment, marginal elite assignment causes a reduction in wages that fades out over time. Five years after assignment, elite assignment reduces wages by 5.3%. This reduction declines to 2.6% after 10 years, and [essentially vanishes] after 15 years.

Takeaways by Macro Roundup^® AI

Marginal assignment to an elite high school causes a 3.2pp decline in the probability of ever having held a formal job five years later at ages 19–20, a 16% drop from the 20% base rate for students just below the cutoff.
The elite-assignment employment disadvantage fades over time, falling to -2.1pp after 10 years (ages 24–25) and a statistically insignificant -0.2pp after 15 years (ages 29–30).
Conditional on formal employment, marginal elite assignment reduces wages by 5.3% after five years and 2.6% after 10 years, and cuts cumulative months of formal work by 14% after five years.

Plunging US Birth Rate Leaves Too Many Colleges With Too Few Kids

Elizabeth Rembert, Amanda Albright and Marie Patino Bloomberg

Date Posted:: January 16, 2026
Is Database:: Database

As America’s demographics roll over, smaller public and private liberal arts colleges have “already hit the precipice.” Btw 2003 and 2024, more than 100 public campuses closed, and ~ 2/3 of private for-profit colleges have shut down since the 2010s.

The country’s tumbling birth rate is pushing schools toward a “demographic cliff,” where a steadily dropping population of people in their late teens and early 20s will leave desks and classrooms empty. Many smaller, lesser-known schools have already hit the precipice. They’re firing professors, paring back liberal arts courses in favor of STEM — or closing altogether. Others will likely reach the cliff in the next few years. Although it has plunged since the 1950s, the US birth rate ticked upward slightly before the 2008 financial crisis, and that brief demographic boost has kept enrollment at larger schools afloat. But the nationwide pool of college-aged Americans is expected to shrink after 2025. The financial pressure will be relentless. “If colleges were facing a stark decline in one or two cohorts, higher ed could likely say, ‘Well, we could admit a few additional students and tighten our belts to muddle through,’” said Nathan Grawe, an economics professor at Carleton College in Minnesota, who has written books about education and demographics. “But it’s one year after another of contraction, of ratcheting up the pressure.”

Takeaways by Macro Roundup^® AI

The US pool of college-aged Americans is expected to shrink after 2025, pushing schools toward a "demographic cliff" in which a steadily dropping population of people in their late teens and early 20s leaves desks and classrooms empty.
Many smaller, lesser-known US colleges have already reached the precipice, firing professors, paring back liberal arts courses in favor of STEM, or closing altogether, with others likely to reach it in the next few years.
Carleton College economics professor Nathan Grawe argues that higher education could muddle through a decline in one or two cohorts by admitting a few additional students and tightening belts, but faces one year after another of contraction.

How Mississippi Transformed Its Schools From Worst to Best

Sarah Mervosh New York Times

Date Posted:: January 13, 2026
Is Database:: Database

Controlling for poverty and demographics, Mississippi has the best outcomes for fourth-grade reading and math, and is near the top in eighth-grade scores. In absolute terms, “eighth graders still rank 41st on national tests for reading, and 35th for math.”

Adjusted for poverty and other student demographics, Mississippi is No. 1 for fourth grade reading and math, and at or near the top in eighth grade, according to the Urban Institute. Mississippi’s gains have been confined mostly to the early years, where the state has focused its efforts. The system revolves around standardized testing, and the gains have not always persisted. By raw scores, Mississippi eighth graders still rank 41st on national tests for reading, and 35th for math. The state pushed through a vast list of other changes from the top down, including changing the way reading is taught, in an approach known as the science of reading, but also embracing contentious school accountability policies other states have backed away from. Unlike No Child Left Behind, the Bush-era federal law that set a goal of having every child in America be proficient in reading and math, Mississippi also measures how much students progress toward proficiency. Schools get credit if students show improvement — and double credit for the improvement of students in the bottom 25%.

Takeaways by Macro Roundup^® AI

Adjusted for poverty and other student demographics, Mississippi ranks No. 1 nationally in fourth grade reading and math and at or near the top in eighth grade, according to the Urban Institute.
Mississippi's gains are concentrated in the early grades where the state focused its efforts, and by raw scores its eighth graders still rank 41st in reading and 35th in math on national tests.
Mississippi's accountability system, unlike No Child Left Behind's proficiency goal, credits schools for student progress toward proficiency and gives double credit for improvement among students in the bottom 25%.

“Educationally similar” monozygotic (MZ) twins raised apart [TRA] have a mean IQ delta of 5.8 points, ~ the same as those raised together. “Educationally dissimilar” MZ TRA have a delta of 12.8 points, closer to non-twin siblings than twins reared together.

How much do schooling differences affect IQ gaps between separated twins?

Takeaways by Macro Roundup® AI

Related Articles:

Using OECD skills data and the Luxembourg Income Study, Burn-Murdoch finds US workers at the lowest levels of literacy and numeracy earn ~ on par with British workers scoring a 2, ~ a mean score.

Does economic growth matter more than education policy for low-skilled workers' pay?

Takeaways by Macro Roundup® AI

Related Articles:

From 1644–1905, Qing China staffed its bureaucracy through exams and patronage. Only 12.6% of exam graduates reached top office, but patronage favored stronger performers, illustrating how merit and connections can be complements rather than substitutes.

Do merit and connections reinforce each other in civil service careers?

Takeaways by Macro Roundup® AI

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Clark and Nielsen replicate the ~8% estimates of the return to education obtained by standard methods, but find evidence of selection biases in favor of high estimated returns. After correcting for these biases, they calculate returns on the order of 3%.

Do publication biases inflate estimated earnings returns to education?

Takeaways by Macro Roundup® AI

Related Articles:

In data from the Mexico City metro area over 2003–2009, students who just missed the exam score cutoff for admission to an elite high school have 5.3% higher wages after five years (2.5% after 10 years) than marginally admitted students.

Does barely getting into an elite high school lower early earnings?

Takeaways by Macro Roundup® AI

Related Articles:

As America’s demographics roll over, smaller public and private liberal arts colleges have “already hit the precipice.” Btw 2003 and 2024, more than 100 public campuses closed, and ~ 2/3 of private for-profit colleges have shut down since the 2010s.

How is a falling birth rate reshaping American colleges?

Takeaways by Macro Roundup® AI

Related Articles:

Controlling for poverty and demographics, Mississippi has the best outcomes for fourth-grade reading and math, and is near the top in eighth-grade scores. In absolute terms, “eighth graders still rank 41st on national tests for reading, and 35th for math.”

How did one state's reading instruction and accountability reforms raise test scores?

Takeaways by Macro Roundup® AI

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