When we look at modern fortunes, it is easy to draw a straight line backward through history. Headlines frequently link contemporary elite wealth, historical country houses, and cultural institutions to centuries-old windfalls—such as 19th-century colonial trade, British slave compensation in 1834, or post-Civil War disparities in the United States. In the UK today, roughly 35% of households receive an inheritance, and for the top 10% of inheritors, these windfalls exceed 50% of their lifetime earnings.
Given these staggering figures, common economic intuition suggests that inherited wealth acts as an unshakeable anchor, cementing family dynasties for centuries.
But is that actually true? A groundbreaking 2026 study by economists Gregory Clark and Neil Cummins published in the Review of Income and Wealth, titled "How Long Do Wealth Shocks Persist? Less Than Three Generations in England, 1700–2026," challenges this narrative head-on. By examining centuries of demographic and probate data, the researchers uncover a surprising truth: unearned, random wealth shocks completely dissipate within three generations.
Inside the Data: The "Families of England" (FOE) Database
To track how wealth moves across time, Clark and Cummins utilized the massive Families of England (FOE) database, a genealogical powerhouse containing 448,358 individuals across 510 rare surnames spanning from 1600 to 2026.
The database is divided into two distinct groups:
Elite Lineages: 240 rare surnames (63,458 people) representing families with significantly higher-than-average wealth in the mid-19th century (including famous historical names like Rothschild, Baring, Courtauld, and Bazalgette).
General Lineages: 270 rare surnames (384,900 people) representing a cross-section of the general English population.
Because of the unique structure of rare surnames, the researchers were able to link 84% of individuals (and 92% for those born between 1800 and 1939) directly to their parents using census records, probate registries, marriage certificates, and tax rolls.
The Natural Experiment: Fertility as a Biological Lottery
To figure out whether inherited money actually drives long-term wealth, the researchers needed a way to isolate pure wealth shocks—windfalls or losses completely disconnected from a family's inherent business skills or work ethic.
They found their natural experiment in pre-1880 England, an era operating under a strict "natural fertility" regime. Within marriage, couples did not practice effective birth control or family planning. Consequently, completed family sizes were a biological lottery, varying wildly from 1 to 20 children per family. Statistical analysis revealed that 93% of the variance in family size was entirely random—unaffected by parental wealth, social status, or age at marriage.
This biological lottery created massive, exogenous wealth shocks for children:
The Small Family Effect: Wealthy parents who randomly had only one or two children passed down enormous per-capita estates. For example, Edward Cazalet (died 1883 with £0.346 million) had an only son who inherited a massive estate worth £0.652 million.
The Large Family Effect: Conversely, wealthy parents who birthed a dozen children diluted their estates entirely. Richard Pulteney (died 1874 with £0.500 million) had 12 surviving children, leaving each with an average of just £0.027 million.
The Findings: How Fast Do Wealth Shocks Vanish?
When the researchers tracked the descendants of these pre-1880 testators across multiple generations, a clear pattern emerged regarding how long wealth shocks persist:
Generation 2 (Children): Sibship size mattered immensely. Controlling for father wealth, each doubling of adult sibship size significantly reduced child wealth.
Generation 3 (Grandchildren): Shocks from family size were still faintly perceptible in the grandchild generation, but their statistical impact shrank dramatically.
Generations 4 & 5 (Great-Grandchildren and Beyond): By the fourth and fifth generations, the effect of initial family size shocks dropped to zero and was no longer statistically distinguishable from random noise.
Summary of Multi-Generational Persistence (Regression Coefficients on Initial Wealth vs. Sibship Size)
| Generation | Initial Wealth Coefficient (Ln) | Initial Sibship Coefficient (Ln) | Statistical Status of Wealth Shocks |
| 2nd Gen (Children) | $0.665^{**}$ | $-0.395^{**}$ | Strong and significant impact |
| 3rd Gen (Grandchildren) | $0.490^{**}$ | $-0.167^*$ | Faint, fading echo |
| 4th Gen (Great-Grandchildren) | $0.376^{**}$ | $-0.066$ (insignificant) | Completely dissipated |
| 5th Gen (Great-Great-Grandchildren) | $0.277^{**}$ | $0.102$ (insignificant) | Completely dissipated |
Note: Data sourced from Clark & Cummins (2026), Table A1 (All children, wealth $\ge 1$).
The Behavioral Twist: Why Inheritances Don't Stick
Why do random wealth shocks fade out so quickly? The study uncovered a fascinating behavioral adjustment among heirs:
Heirs of Small Families (Big Windfalls): Children from small sibships who inherited substantial sums tended to consume and spend down a larger portion of their unearned inheritance.
Heirs of Large Families (Small Windfalls): Children from large sibships who inherited little to nothing tended to accumulate wealth aggressively during their lifetimes, often matching or exceeding the wealth levels of their ancestors.
People naturally adjust their financial behavior and lifestyle to their social standing rather than blindly preserving unexpected monetary windfalls.
The Big Takeaway: It’s Not the Money, It’s the Mindset
Paradoxically, while random wealth shocks vanish within three generations, overall family wealth itself shows remarkable persistence across six generations (exhibiting a correlation of 0.20 even six generations later).
What does this mean? It proves that long-term dynastic wealth is not sustained by the money transfers themselves, but by the underlying transmission of familial behaviors, educational attainment, and occupational abilities.
As the authors point out, F. Scott Fitzgerald was right when he famously remarked, "The rich are different from you and me," and Ernest Hemingway quipped, "Yes, Scott, they have more money." Fitzgerald was the truth-teller: wealthy families endure across centuries not merely because of ancient money stacked in vaults, but because of the persistent cognitive and social traits that enable them to generate and retain wealth anew across every generation.
