John Staddon, professor emeritus of psychology and neuroscience at Duke University, brings unusual precision to a subject that has long been governed more by social convention than by rigorous inquiry in his work, Inevitable Differences: An Inquiry into Human Variation (Academica Press, 2026). His background in experimental psychology and quantitative methods equips him to examine the empirical literature on group differences with a dispassion rarely found in this field. The result is a book that challenges, on both philosophical and empirical grounds, the dominant egalitarian framework shaping contemporary debates on race and inequality.
That framework rests substantially on John Rawls, whose difference principle holds that social and economic inequalities should be arranged to maximize the benefit of the least advantaged. Staddon identifies two problems with this. The first is technical: comparing how much one person values something against how much another does is, as mainstream economics acknowledges, scientifically impossible. The principle is therefore philosophical assertion rather than workable theory. The second objection is economic. Redistributing wealth downward consistently overlooks what the wealthy actually do with their resources. The affluent disproportionately invest in new technologies, businesses, and ventures that over time tend to produce broad-based benefits. Wealth directed toward the less affluent is more commonly consumed immediately. A principle that systematically diverts resources from those best positioned to deploy them productively risks undermining the very economic dynamism that raises living standards across the income spectrum.
The same pattern of conclusions preceding evidence recurs in empirical sociology. The concept of systemic racism functions less as an explanatory mechanism than as a descriptive label applied to any disparity in which black individuals underperform relative to white individuals, regardless of whether a specific discriminatory cause can be identified. This forecloses inquiry rather than opening it. The higher incarceration rates for black Americans, frequently cited as evidence of systemic racism in the criminal justice system, largely track underlying patterns of violent crime. When lenders, insurers, or homebuyers historically incorporated neighborhood crime rates into their decisions, they were responding to actuarial reality rather than racial animus. Treating every downstream consequence of that reality as racism, rather than examining what drives crime rates themselves, substitutes a politically convenient answer for an accurate one.
This tendency is most visible in debates over housing and reparations. Ta-Nehisi Coates’s influential 2014 Atlantic essay placed the Home Owners’ Loan Corporation maps at the center of the argument that federal housing policy systematically stripped black Americans of generational wealth. Economist Price Fishback’s subsequent research complicates this picture considerably: FHA exclusionary lending practices predated the HOLC maps, meaning those maps could not have caused the discrimination attributed to them. The HOLC itself extended loans to black homeowners and lower-income borrowers, a fact that sits awkwardly with its characterization as an instrument of racial exclusion.
The reparations argument faces further difficulties from a 2026 study by John Sabelhaus and Jeffrey Thompson, which directly tests the claim that inherited wealth is the primary driver of the black-white wealth gap. Their findings indicate it is not. Intergenerational transfers account for only a small share of the disparity; lifetime earnings, pension assets, and education account for the majority. The gap is driven primarily by differences in work histories and human capital accumulation, not by the multigenerational transmission of white advantage.
The underlying premise of reparations, that present-day black Americans would be materially better off had slavery never occurred, also warrants scrutiny. By virtually any measurable standard, contemporary African Americans enjoy a substantially higher standard of living than populations in the sub-Saharan nations from which their ancestors came. Migration patterns reinforce the point: large numbers of Africans seek entry to the United States, while very few African Americans seek to relocate to Africa.
Historical evidence also suggests that the effects of severe disruption are overcome more quickly than reparations advocates acknowledge. Economist Bruce Sacerdote’s research showed that descendants of enslaved Americans reached educational and economic parity with free mulattos within roughly two generations of emancipation. Japanese Americans, who suffered significant property losses during wartime internment, surpassed other Asian Americans in earnings within a single generation. Studies of Poles displaced from the eastern Kresy territories after the Second World War found that, despite starting with no material assets, their descendants are now considerably more educated than other Poles, the forced loss of property having redirected family investment toward human capital. The reparations framework, which presumes historical trauma leaves permanent and uncorrectable disadvantage, encounters contradictory evidence at every turn.
On education and inequality, Staddon reaches a counterintuitive conclusion grounded in evolutionary biology: expanding educational opportunity may widen inequality rather than reduce it. When individuals possess differing underlying abilities, richer educational environments allow that variation to express itself more fully. The baseline rises for everyone, but the gap between the highest and lowest performers can widen simultaneously. This does not make expanded education undesirable, but it complicates the assumption that more schooling reliably compresses social inequality.
Nor does wider inequality necessarily mean more poverty. The United States has a higher Gini coefficient than any European country yet lower poverty rates than most of them. A dynamic economy that produces unequal rewards can raise the floor more effectively than a more compressed one. Redistributive policies designed to narrow inequality risk dampening the economic energy that has historically done most of the work in improving the lives of those at the bottom.
Staddon does not sidestep the most contested empirical terrain. Measured IQ scores differ across racial groups in ways that do not favor black Americans. He presents this not as pessimism but as a factual baseline of the same order as average height differences between men and women, an observable reality that any serious analysis must engage with rather than suppress. He cites philosophers and researchers, including Michael Levin and Noah Carl, who have worked rigorously on this material despite professional consequences for doing so.
His interpretation is not fatalistic. The principle of comparative advantage applies to groups as it does to nations. If black Americans demonstrate higher rates of success in domains where IQ is not the primary determinant, including entertainment, athletics, and oratory, then the rational policy response involves cultivating those strengths rather than demanding statistical parity in fields where the distributional challenges are steeper. Markets reward whatever people are willing to value and pay for, and that spectrum is wide.
One substantive limitation deserves mention. Staddon’s expertise in the quantitative measurement of behavior positioned him to engage the intelligence and race literature far more deeply than the book’s appendix permits. That literature is extensive, complex, and largely unfamiliar to general readers. A work positioned to reach a broad audience had the opportunity to serve as a genuine bridge to it. The appendix offers a starting point but not the treatment the subject warrants.
These reservations aside, Inevitable Differences is a serious and intellectually courageous contribution. It applies scientific and philosophical rigor to questions that have too long been handled primarily as matters of political conviction, and it reaches conclusions that the evidence supports even where those conclusions are unwelcome. The social consensus that has suppressed this kind of inquiry, maintained as much by the penalties for dissent as by the strength of the underlying arguments, is weakening. Books like this one accelerate that process.
* * *
Lipton Matthews is a researcher and podcaster. His work has been featured in Mises, The Federalist, Chronicles, American Thinker, Epoch Times, and other publications. He is also author of Busting African Delusions: Institutions, Human Capital, and the Path to Progress.