“…a fresh argument for the productive value of inequality.” - David Autor, Professor of Economics, Massachusetts Institute of Technology
“…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
“…challenges misconceptions that distort our economic debates.” - Arthur Brooks, President of the American Enterprise Institute
“…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 fresh argument for the productive value of inequality.” - David Autor, Professor of Economics, Massachusetts Institute of Technology
“…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
“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 very valuable contribution.” - Larry Summers, former Secretary of the Treasury and director of the National Economic Council, president emeritus, Harvard University
“A full-throated defense of economic dynamism.” - The Wall Street Journal
“…a comprehensive explanation of the modern economy.” - Julian Robertson, Founder, Tiger Management
“Unintended Consequences offers deep and well-argued analyses on almost every issue.” - The New York Times
“…a must-read for serious students of economic policy.” - Glenn Hubbard, Dean, Columbia Business School, and former Chairman of the Council of Economic Advisers
AI Summary.Australia has confirmed H5N1 bird flu in wild marine mammals, prompting vaccination of at-risk bird species, while no cases have been detected in farmed poultry and human risk remains low.
Laura ChungNew York Times
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Australia confirmed its first case of H5N1 in June, and the virus has since rapidly spread, with at least 309 confirmed bird flu events that have killed more than 1,000 birds.
Is Australia's bird flu outbreak spreading beyond birds to marine life?
Core argument: Australia confirmed H5N1 in a long-nosed fur seal in South Australia—the disease’s first detected crossing into Australian mammals—with a second seal suspected dead, signaling escalating spread beyond avian populations.
The Australian government began vaccinating at-risk bird species this month. Among those receiving the vaccination will be 5,000 little penguins in the state of Victoria. Authorities confirmed the first case of H5N1 in a long-nosed fur seal in South Australia last week. A second seal was suspected to have died from the disease on Monday. A vaccine has not yet been approved for use in Australian mammals. The disease has not been detected in poultry or on farms, according to the government, and the risk to humans remains low.
Takeaways by Macro Roundup® AI
Australia confirmed H5N1 in a long-nosed fur seal in South Australia—the disease’s first detected crossing into Australian mammals—with a second seal suspected dead, signaling escalating spread beyond avian populations.
Australia’s H5N1 vaccination program covers at-risk bird species including 5,000 little penguins in Victoria, but no approved mammalian vaccine exists, leaving infected seal populations without a protective intervention.
Related Articles:
Bird Flu Is Back— Bird flu is surging in part due to the fall migration, resulting in the deaths of almost 7mm farmed birds in the US since the start of September.
AI Summary.Global fertility has fallen below replacement level, meaning population will peak at roughly 9 billion around 2056 and then decline, driven by large existing generations masking the underlying shortfall in births.
Jesús Fernández-Villaverde and Patrick NorrickUniversity of Pennsylvania
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The UN appears to systematically overestimate births; e.g. 33 of 37 countries with high-quality statistics registered fewer births in 2024 than the UN had forecast. Fernández-Villaverde and Norrick infer humanity is below replacement fertility in 2026.
Will declining birth rates eventually shrink the global economy?
Core argument: Global fertility has fallen below replacement level as of 2026, ending humanity’s ability to sustain long-run population stability without a reversal in trends.
In Table A1 we compare the World Population Prospects (WPP) estimates of births in 2022-2023 with the official numbers reported by several countries. [A2 shows the full sample with the deviations.] As of 2026, humanity is likely to be below the replacement fertility level: we are having fewer births than we need to keep population constant in the long run. This astonishing fact does not mean that population has stopped growing. Because of momentum effects (the large cohorts of women born two or three decades ago are having their children now, and their own parents have not died yet), world population will keep growing for another 30 years or so. But unless trends change, it will peak at roughly 9 billion around 2056 and then start falling, first slowly, then fast.
Takeaways by Macro Roundup® AI
Global fertility has fallen below replacement level as of 2026, ending humanity’s ability to sustain long-run population stability without a reversal in trends.
Population momentum—driven by large cohorts of women now in peak childbearing years—will sustain growth for roughly 30 more years before world population peaks at approximately 9 billion around 2056 and begins declining.
The Wealth of Working Nations— Japan achieved GDP growth per working-age adult of 31.9% between 1998 and 2019, slightly faster than the US at 29.5%. @King_ofSweden
AI Summary.US greenhouse gas emissions are projected to fall 27–41% below 2005 levels by 2040, with the range driven by whether clean energy cost competitiveness accelerates decarbonization or policy rollbacks reverse two decades of emissions progress.
Hannah Kolus, Ben King, Parker Case, Michael Gaffney, et al.Rhodium Group
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Rhodium projects that under current policy, US GHG emissions will be 26–29% under the 2005 level in four years, driven by an influx of natural gas and renewable production. Their forecast for 2040 is 27-41% below the 2005 level.
Will clean energy cost cuts or policy reversals determine America's emissions path?
The US is on track to reduce greenhouse gas (GHG) emissions by 27-41% below 2005 levels in 2040, considering all relevant federal and state policies on the books as of June 2026. These emissions outcomes represent divergent futures after the late 2020s. In the high-emissions scenario, the emissions reductions that have characterized the last 20 years slow through the early 2030s before reversing direction altogether, with growing emissions through most of that decade. In the low-emissions case, the economic competitiveness of clean technologies relative to fossil incumbents, alongside an imperative for “speed-to-power” for large loads, continues—and accelerates—GHG emission declines through 2040.
Related Articles:
Fighting Words: The Energy Transition in 2026— As measured by useful final energy consumption in 2024, nuclear provided 6% of America’s 44.5 exajoules, renewables 9%, and fossil fuels 85%. The corresponding…
The Most Amazing Climate Policy Figure— Between 1992 and 2025, the US economy significantly decarbonized; the ratio of carbon dioxide emissions to GDP fell from ~ .44 to ~.19, largely being driven by…
AI Summary.China is reducing incentives for researchers to publish in foreign journals by removing publication records in international databases from academic promotion criteria, reversing a trend that saw Chinese-authored papers grow from 5% to nearly a third of global scientific output over two decades.
Sun Yu, Michael Peel and Eleanor OlcottFinancial Times
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China is seeking to restrict the publication of domestic scientific research abroad. The government may push Chinese universities and research institutions to “reduce or remove the weight given to publishing in leading international journals.”
Is China retreating from global scientific collaboration?
Chinese policymakers are discussing ways to reduce the incentives for scientific researchers to submit their findings to foreign journals. The government could push Chinese universities and research institutions to reduce or remove the weight given to publishing in leading international journals in deciding academic promotion and tenure, the people said. Papers by China-based authors accounted for almost a third of the global total in the SCI — a database of leading international scientific journals — in 2024, up from 5% two decades earlier.
Related Articles:
The Growing Self-Reliance of Chinese Innovation— China's domestic innovation self-reliance across critical technology fields rose from 2% to 24% between 2000 and 2025, while the U.S. share fell from 31% to 18%. China now leads the U.S. in 8 of 11 critical technology fields, with remaining U.S. advantages in biotechnology, quantum technology
China and the Future Of Science— Greer argues that the scale and intensity of investment in science in China suggests that “even if you believe that political instability or economic…
AI Summary.New World screwworm detections are expanding in Texas, threatening a beef industry already under supply pressure from a domestic cattle herd at its smallest in 75 years.
Ilena PengBloomberg
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The US Department of Agriculture confirmed two new cases of New World screwworm in Texas, bringing the total number of cases to four. The US’s domestic cattle herd is at a 75-year low.
Is livestock disease threatening beef supply during a cattle shortage?
Core argument: Screwworm parasites in major cattle-producing states lead to higher veterinary costs and potential herd culling, reducing beef supply availability.
The US Department of Agriculture confirmed an additional two cases of New World screwworm in Texas, bringing the total number of detections to four and raising concerns that the parasite is spreading in the biggest cattle-producing state. The parasitic fly was detected in a calf in La Salle County and a dog in Andrews County; early reports indicate the dog was recently in Mexico. [The screwworm brings] more worries for a US beef industry already struggling with supply tightness as the domestic herd has dwindled to a 75-year low.
Takeaways by Macro Roundup® AI
Screwworm parasites in major cattle-producing states lead to higher veterinary costs and potential herd culling, reducing beef supply availability.
Deadly Screwworm Pest Spreads in Texas With Two New Cases.
The parasitic fly was detected in a calf in La Salle County and a dog in Andrews County, early reports.
Related Articles:
Flesh-Eating Pest Confirmed in U.S. Cattle— A flesh-eating livestock pest has been detected in U.S. cattle for the first time since the 1960s, triggering quarantine measures and aerial dispersal of sterile flies — the only known control method — while a new $750m domestic production facility is under construction to scale output from 100m to 300m
AI Summary.Precise base editing technology can correct individual DNA mutations in human embryos without the structural damage caused by earlier gene-editing methods, raising the possibility of eliminating inherited disease — but also of selecting desired traits before birth.
Carl ZimmerNew York Times
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Scientists at Columbia University successfully edited the DNA of early human embryos via a process called “base editing,” which has “unprecedented accuracy” relative to techniques like CRISPR.
Scientists at Columbia University have edited the DNA of early human embryos with unprecedented accuracy, an achievement that could open the way to babies engineered with particular characteristics. The prospect has fueled controversy for years. On the one hand, the technology might one day enable parents to safely repair disease-causing mutations in embryos. But it might also be used to select desired traits — a practice that some ethicists have argued is nothing short of eugenics. Dieter Egli, a geneticist at Columbia University who led the research, called for a public conversation about the pros and cons of altering embryonic DNA. “As a scientist, you can provide the data for discussion, but then essentially there you stop and let others take over,” he said. With a newer technology called base editing, Dr. Egli and his colleagues were able to meticulously replace individual genetic letters in sequences of DNA without causing the damage often observed with an earlier form of gene editing, CRISPR.
Ancient DNA Reveals Pervasive Directional Selection Across West Eurasia— Ancient DNA analysis of nearly 16,000 West Eurasians reveals that hundreds of alleles underwent strong directional selection over the past 10,000 years, shifting genetic predictors of body fat, schizophrenia risk, and cognitive performance by amounts equivalent to one standard deviation of modern variation.
AI Summary.Population forecasts are dominated by model choice, not parameter uncertainty, with model selection accounting for up to 98% of output variance across projections. Different modeling approaches produce wildly divergent outcomes—from under 4bn to over 15bn people by 2075—making demographic projections tools for exploring possibilities rather than reliable predictions.
Samuele Lo Piano, Marta Kuc-Czarnecka, Roger Pielke, and Andrea SaltelliSocial Science Research Network
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Simulation of the decision chain yielding projections of world population in 2050 that range from 6 to 14B suggests most of the variance in demographic forecasts arises not from parameter uncertainty or data randomness but from model choice.
How much do demographic models actually predict versus explore?
Core argument: Model choice accounts for 98% of output variance in 2050 global population projections, driving divergent forecasts ranging from 4–25 billion.
We explore demographic predictions by propagating all plausible choices that can be made during the analysis through the modelling process. This approach involves navigating the so-called ’garden of forking paths’—mimicking in silico what would happen if multiple investigators were to examine the same problem. For this, we now abandon [the Chinese government mathematician] Song Jian’s ‘historic’ model and turn to models currently in use: the Cohort-Component and UN WPP models, the Lee-Carter model and the Lotka-Volterra model. Note that in standard use, these tools are used in isolation, see e.g. the FAO’s How to Feed the World in 2050, resting on a single UN WPP population trajectory shielding the reader from the compounding effect of their uncertainty. Unsurprisingly, the exercise capturing the modelling of the modelling process for global population projections to 2050 and 2075 reveals distinct characteristics regarding the sensitivity and projection outcomes of the different models. Once abandoned the straitjacket of Song’s approach, uncertainty is free to manifest itself. The overall uncertainty distributions of the projected populations show a wide range of possible outcomes, reflecting the inherent uncertainties in demographic projections.
Takeaways by Macro Roundup® AI
Model choice accounts for 98% of output variance in 2050 global population projections, driving divergent forecasts ranging from 4–25 billion.
Song Jian’s optimization model converges to 700 million people by 2080 across all parameter variations (670–700 million range), demonstrating structural.
Global fertility declined from 5 children per woman in 1950 to 2.1 currently, with no rebound in countries where rates.
World Depopulation: Prospects and Implications— Nicholas Eberstadt @AEIecon argues that given its relatively high fertility rate relative to both East Asia and Europe, the US is primed to be the…
Take the Under— .@RogerPielkeJr argues that more realistic projections of global population and GDP growth suggest that “even partial future policy successes could more easily…
AI Summary.Most major inventions arrived close to the earliest point they were technically feasible, with 90% of 166 inventions estimated to have been achievable within 50 years of when they actually appeared, and over half within 10 years.
Brian PotterConstruction Physics
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An analysis using Claude finds that for more than half of 190 inventions, the delay between the earliest date at which the invention became possible and the invention’s realization was 10 years or less. Since 1900, the fraction rose from ~50 to 75%.
How Soon Can We Expect Major Inventions to Arrive?
Core argument: 90% of inventions had straightforward paths to earlier creation within 50 years, indicating most breakthroughs face modest rather than fundamental.
I used a list of 190 major inventions. For each invention, I asked Claude Opus 4.7 how much earlier it could have been invented. The graph shows how much earlier, on average, each invention could have appeared for both the “earliest plausible” and “earliest straightforward” date ranges. We can clearly see a few trends on this graph. One is that for most inventions, the gap between when they could have been invented and when they were actually invented is not particularly large. Of the 166 inventions Claude estimated a date for, 107 of them (64%) had an “earliest plausible” date 50 years or less from the actual date, and 150 of them (90%) had an “earliest straightforward” date 50 years or less from the actual date. For more than half the inventions, the average earliest straightforward date of invention was 10 years or less from the actual date.
Takeaways by Macro Roundup® AI
90% of inventions had straightforward paths to earlier creation within 50 years, indicating most breakthroughs face modest rather than fundamental.
Over 50% of inventions showed 10-year-or-less gaps between feasible and actual dates, driving the conclusion that market demand and adoption.
Are Ideas Getting Harder to Find?— Research productivity in the US has declined by a factor of 41 since the 1930s, averaging a 5% annual decrease. To sustain constant GDP growth, the US must…
