Preferential Attachment: Why The Rich Get Richer

This article is an excerpt from the Shortform summary of "The Black Swan" by Nassim Taleb. Shortform has the world's best summaries of books you should be reading.

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What is preferential attachment? Who benefits from preferential attachment? Who loses?

Preferential attachment is the innate human tendency to flock to past successes, regardless of whether those successes are the product of merit or chance. Preferential attachment is a form of cumulative advantage.

We’ll cover examples of preferential attachment, look at how it increases inequality in society, and discover when it’s wrong.

Preferential Attachment Example

Consider research scholarship. Sociologist Robert K. Merton has observed that academics rarely read all the papers they cite; rather, they look at the bibliography of a paper they have read and pick sources to cite more or less at random. 

Now imagine a scholar cites three authors at random. Then a second scholar cites those same three authors, because the first author cited them. Then a third does the same thing. Suddenly the three authors that have been cited are considered leaders in their field, all by dint of dumb luck.

The phenomenon identified by Merton’s study has been called both “cumulative advantage” and “preferential attachment.” These concepts describe the innate human tendency to flock to past successes, regardless of whether those successes are the product of merit or chance.

Although cumulative advantage/preferential attachment provides a better account of unfairness than the superstar effect—because it accounts for randomness in the distribution of advantage/preference—it still isn’t a perfect theory of Extremistan unfairness. This is because, according to cumulative advantage/preferential attachment, winners stay on top. Once an entity—a company, an academic, a professional sports coach—reaches a certain level of success, cumulative advantage/preferential attachments holds that that entity will continue to be successful, because humans naturally favor past success. But this doesn’t reflect reality.

For example, according to cumulative advantage/preferential attachment, Apple will forever be the king of consumer electronics, and Google will forever own the Internet. But even a cursory knowledge of business history shows a belief like this to be misguided. Consider this: If you tracked the 500 largest U.S. companies from 1957 to 1997, you’d discover that only 74 lasted the full 40 years. Some ceased to exist by virtue of mergers, but most simply failed. In other words, even in Extremistan, giants can occasionally be toppled by dwarfs.

Nevertheless, despite the possibility of creative destruction, Extremistan is defined by extreme concentration—of prestige, income, capital, influence, size, or what have you. These concentrations create the appearance of stability—larger, more powerful entities are more resilient—but they actually create the potential for catastrophic black swans. This is the problem with the theory of preferential attachment.

The example par excellence of the risks of concentration is the banking industry. The explosive growth and interrelation of the major global financial institutions were the catalysts for the Great Recession of 2008.

(Shortform note: The popularity of The Black Swan is due, in large part, to Taleb’s clairvoyance about the vulnerabilities of the financial industry. The book was published in April 2007, before the worst of the crisis, yet Taleb describes the contours of that crisis with eerie precision.)

The most far-reaching unfairness of Extremistan, however, more so than economic inequality, is inequality in intellectual influence. As illustrated by Merton’s citation example just above, intellectual influence can be a matter of dumb luck rather than ability or insightfulness. This problem becomes acute when we trust thought leaders—”experts”—with our lives and livelihoods. Preferential attachment is a problem when it’s happening and when it fails.

The Contours of Extremistan

Although one needs only an intuitive sense of phenomena like wealth and market returns to understand that they don’t adhere to the same rules as phenomena like height and weight, throughout the book Taleb provides a robust theoretical and statistical scaffolding for his claims about the differences between Mediocristan and Extremistan. 

Unfairness in Extremistan

As exemplified by figures like Beyoncé and Jeff Bezos, social and economic advantages accrue highly unequally in Extremistan. These are further examples of the power of preferential attachment.

One reason for this disparity is the “superstar effect.” Coined by economist Sherwin Rosen to describe the unequal distributions of income and prestige in Extremistan sectors like stand-up comedy, classical music, and research scholarship, the “superstar effect” operates when marginal differences in talent yield massive rewards.


The superstar effect, it’s vital to note, is meritocratic—that is, those with the most talent, even if they’re only slightly more talented than their competitors, get the spoils. What a theory like Rosen’s fails to take into account, however, is that all-important aspect of life in Extremistan: dumb luck. The superstar effect is often made stronger through preferential attachment.

Preferential Attachment: Why The Rich Get Richer

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Amanda Penn

Amanda Penn is a writer and reading specialist. She’s published dozens of articles and book reviews spanning a wide range of topics, including health, relationships, psychology, science, and much more. Amanda was a Fulbright Scholar and has taught in schools in the US and South Africa. Amanda received her Master's Degree in Education from the University of Pennsylvania.

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