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The Marginal Revolution: Rise and Decline, and the Pending AI Revolution
Tyler traces the birth, triumph, and quiet decline of marginalism — the idea that made modern economics possible. Beginning with the 1871 Marginal Revolution and ending with the AI tools transforming research today, this is a book about how ideas are born, why they take so long to arrive, and what happens when machines begin to see around corners that humans cannot.
118 pages, Unknown Binding
About the author
Tyler Cowen
103 books866 followersTyler Cowen (born January 21, 1962) occupies the Holbert C. Harris Chair of economics as a professor at George Mason University and is co-author, with Alex Tabarrok, of the popular economics blog Marginal Revolution. He currently writes the "Economic Scene" column for the New York Times and writes for such magazines as The New Republic and The Wilson Quarterly.
Cowen's primary research interest is the economics of culture. He has written books on fame (What Price Fame?), art (In Praise of Commercial Culture), and cultural trade (Creative Destruction: How Globalization is Changing the World's Cultures). In Markets and Cultural Voices, he relays how globalization is changing the world of three Mexican amate painters. Cowen argues that free markets change culture for the better, allowing them to evolve into something more people want. Other books include Public Goods and Market Failures, The Theory of Market Failure, Explorations in the New Monetary Economics, Risk and Business Cycles, Economic Welfare, and New Theories of Market Failure.
Cowen's primary research interest is the economics of culture. He has written books on fame (What Price Fame?), art (In Praise of Commercial Culture), and cultural trade (Creative Destruction: How Globalization is Changing the World's Cultures). In Markets and Cultural Voices, he relays how globalization is changing the world of three Mexican amate painters. Cowen argues that free markets change culture for the better, allowing them to evolve into something more people want. Other books include Public Goods and Market Failures, The Theory of Market Failure, Explorations in the New Monetary Economics, Risk and Business Cycles, Economic Welfare, and New Theories of Market Failure.
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Displaying 1 - 3 of 3 reviews
June 21, 2026
What if the Marginal Revolution was not the culmination of economic thought, but a stage? For someone who has spent decades defending the Subjective Theory of Value against The Labor Theory of Value theorists, this book is intellectually destabilizing in the best possible way. My overall reaction is: Cowen is mostly right about the decline of marginalism as a research methodology.
He is probably wrong that it diminishes the importance of subjective value.
Tyler Cowen has written one of the most provocative books on economics I have read in years. Not because he defends marginalism. But because he argues it is becoming obsolete. That statement alone should stop every economist in his tracks.
The Marginal Revolution of 1871–1874 solved one of the deepest puzzles in economics: why diamonds cost more than water despite water being more useful. William Stanley Jevons, Leon Walras, and Carl Menger all independently arrived at basically the same insight: Value depends not on total usefulness but on marginal usefulness—the value of one additional unit. And that value was completely subjective, not intrinsic to any economic offering (human life has intrinsic value, but commodities, goods, services, experiences and even transformations do not). It's in the mind of the customer, and customers can change their mind in an instant.
For more than a century, marginalism became the intellectual foundation of economics. Supply and demand. Consumer choice. Opportunity cost. Price theory. Cost justification. Virtually all modern economic reasoning traces back to this revolution. Tyler Cowen knows this history as well as anyone. Yet his startling argument is that marginalism's greatest success may have prepared the way for its decline.
The reason is AI. Machine learning systems increasingly discover patterns, generate hypotheses, make predictions, and optimize decisions without relying upon human economic intuition. In finance, medicine, science, and increasingly economics itself, algorithms are replacing explanatory theories with predictive performance. The machine often gets the answer right without being able to explain why. Or perhaps more troubling: It gets the answer right in ways humans can no longer understand.
Cowen argues that economics is already moving away from price theory and toward empiricism, machine learning, and prediction. The future economist may resemble a data scientist more than a theorist. This is where the book becomes truly fascinating. Cowen is not merely writing intellectual history. He is asking whether human intuition itself is being displaced. Whether marginalism was ultimately a bridge to something beyond marginalism.
The historical sections are equally compelling. Cowen explores why seemingly obvious insights often take centuries to emerge. He shows how Galileo, the Salamanca theologians, 19 century Frenchman and engineer Jules Dupuit, and others glimpsed pieces of marginalist reasoning long before the revolution occurred.
The lesson is humbling. Ideas that seem obvious today were invisible for centuries. And perhaps some of our current assumptions are equally invisible to us. I found myself agreeing with much of Cowen's diagnosis while resisting parts of his prognosis.
The decline of marginalism as an academic research tool seems plausible.
The decline of subjective value seems improbable.
AI may optimize. AI may predict. AI may even discover. But value remains rooted in human purposes, preferences, aspirations, and meaning.
No algorithm can tell us what ought to matter. Only what appears to matter.
Still, this is precisely the kind of book that great thinkers write. It forces readers to question assumptions they didn't realize they had.
The greatest threat to a paradigm is not criticism. It is success.
This book is a must read for people interested in the history of ideas, and an attempt to peer around the corner of what comes next.
Memorable
"How is it that new insights come to pass? If eventually the insight seems obvious, why didn't we see it before?"
— Tyler Cowen, The Marginal Revolution
"Some insights are very hard to grasp, even if they are apparently simple once they are understood."
"People need to see around corners in the right way to understand these insights and incorporate them into their worldviews."
"Economics was so late to develop because it was so hard to peer around its corners."
"One sign of the decay of interest in marginalism is that price theory has moved to being a niche interest in economics."
"Economic intuition, RIP. And marginalism with it."
"In machine learning, we let the algorithm build the theory for us."
"You are currently witnessing the weakest version of the thing you ever will see."
(This may become one of the defining quotations of the AI era.)
"Contemporary economics was born from the Marginal Revolution, but if we are forecasting its future right now it's hard to see even one move ahead."
"Maybe our intuitions about the world, including the economic world, were never so strong in the first place."
"Chicago price theory really has lost. I think it is essentially lost to posterity." –Steve Levitt
He is probably wrong that it diminishes the importance of subjective value.
Tyler Cowen has written one of the most provocative books on economics I have read in years. Not because he defends marginalism. But because he argues it is becoming obsolete. That statement alone should stop every economist in his tracks.
The Marginal Revolution of 1871–1874 solved one of the deepest puzzles in economics: why diamonds cost more than water despite water being more useful. William Stanley Jevons, Leon Walras, and Carl Menger all independently arrived at basically the same insight: Value depends not on total usefulness but on marginal usefulness—the value of one additional unit. And that value was completely subjective, not intrinsic to any economic offering (human life has intrinsic value, but commodities, goods, services, experiences and even transformations do not). It's in the mind of the customer, and customers can change their mind in an instant.
For more than a century, marginalism became the intellectual foundation of economics. Supply and demand. Consumer choice. Opportunity cost. Price theory. Cost justification. Virtually all modern economic reasoning traces back to this revolution. Tyler Cowen knows this history as well as anyone. Yet his startling argument is that marginalism's greatest success may have prepared the way for its decline.
The reason is AI. Machine learning systems increasingly discover patterns, generate hypotheses, make predictions, and optimize decisions without relying upon human economic intuition. In finance, medicine, science, and increasingly economics itself, algorithms are replacing explanatory theories with predictive performance. The machine often gets the answer right without being able to explain why. Or perhaps more troubling: It gets the answer right in ways humans can no longer understand.
Cowen argues that economics is already moving away from price theory and toward empiricism, machine learning, and prediction. The future economist may resemble a data scientist more than a theorist. This is where the book becomes truly fascinating. Cowen is not merely writing intellectual history. He is asking whether human intuition itself is being displaced. Whether marginalism was ultimately a bridge to something beyond marginalism.
The historical sections are equally compelling. Cowen explores why seemingly obvious insights often take centuries to emerge. He shows how Galileo, the Salamanca theologians, 19 century Frenchman and engineer Jules Dupuit, and others glimpsed pieces of marginalist reasoning long before the revolution occurred.
The lesson is humbling. Ideas that seem obvious today were invisible for centuries. And perhaps some of our current assumptions are equally invisible to us. I found myself agreeing with much of Cowen's diagnosis while resisting parts of his prognosis.
The decline of marginalism as an academic research tool seems plausible.
The decline of subjective value seems improbable.
AI may optimize. AI may predict. AI may even discover. But value remains rooted in human purposes, preferences, aspirations, and meaning.
No algorithm can tell us what ought to matter. Only what appears to matter.
Still, this is precisely the kind of book that great thinkers write. It forces readers to question assumptions they didn't realize they had.
The greatest threat to a paradigm is not criticism. It is success.
This book is a must read for people interested in the history of ideas, and an attempt to peer around the corner of what comes next.
Memorable
"How is it that new insights come to pass? If eventually the insight seems obvious, why didn't we see it before?"
— Tyler Cowen, The Marginal Revolution
"Some insights are very hard to grasp, even if they are apparently simple once they are understood."
"People need to see around corners in the right way to understand these insights and incorporate them into their worldviews."
"Economics was so late to develop because it was so hard to peer around its corners."
"One sign of the decay of interest in marginalism is that price theory has moved to being a niche interest in economics."
"Economic intuition, RIP. And marginalism with it."
"In machine learning, we let the algorithm build the theory for us."
"You are currently witnessing the weakest version of the thing you ever will see."
(This may become one of the defining quotations of the AI era.)
"Contemporary economics was born from the Marginal Revolution, but if we are forecasting its future right now it's hard to see even one move ahead."
"Maybe our intuitions about the world, including the economic world, were never so strong in the first place."
"Chicago price theory really has lost. I think it is essentially lost to posterity." –Steve Levitt
June 5, 2026
This book is essentially about human intuition: the role it played in producing scientific developments in the past, and its waning importance in the wake of AI. But rather than discuss those ideas in the abstract, Cowen builds his arguments around the history and future of economic theory.
The first half of this book is a history of economic theory in the 19th century. Cowen discusses the development of "marginalism"; namely, the idea that one should understand human behavior as responding to incentives at the margin (Cowen emphasizes that marginalism comes in many forms). Marginalism might seem obvious to anyone who has any familiarity with economic theory, but surprisingly, it was unheard of before the 19th century. Cowen does a brilliant job of exploring why that might be, in part by comparing marginalism to other scientific developments that took place around the same time, such as advances in geology and Darwin's theory of natural selection.
Cowen's history of marginalism undergirds a broader discussion on the role of intuition in scientific advancements. One notion is that intuition can produce ideas that then take on a life of their own if the circumstances are right (Cowen places a strong emphasis on the academic institutions that fostered scientific exploration in 19th century Europe). While marginalism was first developed to establish a theoretical basis for supply and demand dynamics, it in turn enabled powerful empirical techniques that allow for the exploration of all sorts of questions in the social sciences.
In addition, an underrated component of intuition is the ability to recognize when an idea is scalable. Many writers had stumbled upon marginalism before its full application was realized, but none of those thinkers had understood that marginalism constitutes an abstract set of ideas that can be applied in a wide range of contexts.
I will say, as much as I enjoyed Cowen's discussion of marginalism, I wish he had grounded it more in historical detail. Cowen touches a bit upon Jevons, the economist most responsible for developing marginalism, but I craved more biography, as well as a deeper dive into the trajectory of Jevons's intellectual development.
The second half of this book pivots to the present, and discusses how, in the wake of advanced empirical techniques and LLMs, marginalism has become less important. Basically, rather than rely on intuitive economic stories, economists can delegate to multi-million-parameter models that use brute force to generate hypotheses and make predictions. Because the calculations are done by AI rather than human scientists, the hypotheses and predictions no longer need be intuitive. But once intuition loses its value, what role does the scientist have? I wonder if, in the future, much of scientists' time will be spent building intuition for AI-generated science.
The first half of this book is a history of economic theory in the 19th century. Cowen discusses the development of "marginalism"; namely, the idea that one should understand human behavior as responding to incentives at the margin (Cowen emphasizes that marginalism comes in many forms). Marginalism might seem obvious to anyone who has any familiarity with economic theory, but surprisingly, it was unheard of before the 19th century. Cowen does a brilliant job of exploring why that might be, in part by comparing marginalism to other scientific developments that took place around the same time, such as advances in geology and Darwin's theory of natural selection.
Cowen's history of marginalism undergirds a broader discussion on the role of intuition in scientific advancements. One notion is that intuition can produce ideas that then take on a life of their own if the circumstances are right (Cowen places a strong emphasis on the academic institutions that fostered scientific exploration in 19th century Europe). While marginalism was first developed to establish a theoretical basis for supply and demand dynamics, it in turn enabled powerful empirical techniques that allow for the exploration of all sorts of questions in the social sciences.
In addition, an underrated component of intuition is the ability to recognize when an idea is scalable. Many writers had stumbled upon marginalism before its full application was realized, but none of those thinkers had understood that marginalism constitutes an abstract set of ideas that can be applied in a wide range of contexts.
I will say, as much as I enjoyed Cowen's discussion of marginalism, I wish he had grounded it more in historical detail. Cowen touches a bit upon Jevons, the economist most responsible for developing marginalism, but I craved more biography, as well as a deeper dive into the trajectory of Jevons's intellectual development.
The second half of this book pivots to the present, and discusses how, in the wake of advanced empirical techniques and LLMs, marginalism has become less important. Basically, rather than rely on intuitive economic stories, economists can delegate to multi-million-parameter models that use brute force to generate hypotheses and make predictions. Because the calculations are done by AI rather than human scientists, the hypotheses and predictions no longer need be intuitive. But once intuition loses its value, what role does the scientist have? I wonder if, in the future, much of scientists' time will be spent building intuition for AI-generated science.
April 6, 2026
The Marginal Revolution: Rise and Decline, and the Pending AI Revolution (2026) by Tyler Cowen is a rumination on the past, present and future of economics. Cowen is an economist at George Mason University and a prolific blogger, podcaster and public intellectual. The book is free to download.
Cowen writes about how marginalism enabled economics to provide a rigorous, useful tool for economic analysis. He writes about William Stanley Jevons and how he described and developed marginalism. Cowen then looks at why economics took so long to arrive as a discipline and obtain importance. He compares it to Evolution and how various theories took time to become accepted and extensively used. Finally Cowen writes about how AI and LLMs are changing economics and how they may shift the discipline from being one focused on marginalism to something very different. He also writes about how finance has shifted from employing economists to employing mathematicians and physicists for theories instead.
The Marginal Revolution is an interesting read and any fans of Cowen should enjoy it.
Cowen writes about how marginalism enabled economics to provide a rigorous, useful tool for economic analysis. He writes about William Stanley Jevons and how he described and developed marginalism. Cowen then looks at why economics took so long to arrive as a discipline and obtain importance. He compares it to Evolution and how various theories took time to become accepted and extensively used. Finally Cowen writes about how AI and LLMs are changing economics and how they may shift the discipline from being one focused on marginalism to something very different. He also writes about how finance has shifted from employing economists to employing mathematicians and physicists for theories instead.
The Marginal Revolution is an interesting read and any fans of Cowen should enjoy it.
Displaying 1 - 3 of 3 reviews