Baumol effect
Based on Wikipedia: Baumol effect
In 1965, William J. Baumol and William G. Bowen stood before a paradox that threatened to unravel the logic of the modern economy. They were studying the performing arts, specifically the cost of putting on a string quartet concert. The math was simple, brutal, and seemingly inescapable: a violinist playing a Schubert quartet in a standard concert hall in 1965 could not play any faster than a violinist in 1820. The output per man-hour was fixed by the laws of physics and the demands of the score. A four-movement piece took exactly as long then as it did now. Yet, the wages of these musicians had skyrocketed. If the cost of labor rises while the output per hour remains stagnant, the price of the concert must rise. But how could a society afford to pay musicians more just to play the same number of notes at the same speed?
The answer lies in the invisible hand of the broader economy. While the violinist's productivity was frozen in time, the productivity of the factory worker, the software engineer, and the truck driver was exploding. The automobile sector, the tech sector, and the retail sector were generating far more value per hour worked. To keep a violinist from quitting to become a factory manager earning a much higher wage, the orchestra had to match that rising wage. The orchestra had to compete for labor against the entire progressive sector of the economy. This is the Baumol effect, or "Baumol's cost disease," a phenomenon that explains why your college tuition, your hospital bill, and your concert ticket are getting more expensive every year, even as the price of your television, your car, and your smartphone collapses.
It is a counterintuitive truth that the very success of our technological progress is what makes essential services unaffordable. We often look at rising costs in healthcare or education and assume inefficiency, waste, or corporate greed. We assume that if a teacher can only teach thirty students a day, or a surgeon can only perform one operation at a time, and the price goes up, something must be broken. But Baumol and Bowen argued that nothing is broken. In fact, the system is working exactly as it should. The rising cost of labor-intensive services is the price we pay for the staggering efficiency gains in the manufacturing and technology sectors.
The Mechanics of Unbalanced Growth
To understand the disease, one must first understand the anatomy of economic growth. Not all sectors of the economy grow at the same rate. Economists differentiate between "progressive" sectors, where technology and innovation drive massive increases in productivity, and "non-progressive" sectors, where such gains are minimal or non-existent.
In a progressive sector, a worker in 2026 might produce one hundred times more output than a worker in 1960. This is the story of agriculture, manufacturing, and increasingly, software. A single farmer today can feed thousands, a task that once required an entire village. A single line of code can automate the work of a thousand clerks. Because these workers are generating more value, employers can pay them higher wages without raising the price of their goods. In fact, the increased supply of goods often drives prices down. This is why a 2026 television costs a fraction of what a 1960 television cost in real terms, despite being infinitely more powerful.
But the economy is a single, interconnected labor market. Workers are mobile. If the wages in the automobile industry rise because of high productivity, workers in other industries will naturally demand similar wages to stay. A retail manager, whose productivity has not increased because the fundamental act of managing a store has not changed, will not accept a stagnant salary while their peers in tech or auto are getting raises. If they do not get a raise, they leave. They quit to work in the high-productivity sector.
Consequently, wages in the low-productivity sector must rise to compete for talent, even though the output per hour has not changed. This creates a unique economic pressure. In the high-productivity sector, rising wages are offset by rising output, keeping unit costs stable. In the low-productivity sector, rising wages are not offset by rising output. The cost per unit of service inevitably rises.
Baumol summarized this dynamic in a 1967 paper with a chilling clarity:
If productivity per man-hour rises cumulatively in one sector relative to its rate of growth elsewhere in the economy, while wages rise commensurately in all areas, then relative costs in the nonprogressive sectors must inevitably rise, and these costs will rise cumulatively and without limit.
The "progress" of the technologically advanced sectors inevitably adds to the costs of the technologically stagnant sectors. The only way to avoid this would be to "seal off" the labor markets of the stagnant sectors and hold wages absolutely constant, a scenario Baumol deemed "a most unlikely possibility." And even if you could hold wages constant, the opportunity cost would be a mass exodus of talent to the higher-paying sectors, leaving the schools, hospitals, and orchestras empty.
The Origins: From Barbers to Quartets
The roots of this insight stretch back further than the 1960s. In 1949, the French economist Jean Fourastié observed the unequal technological progress across industries. He noted that while some sectors were being revolutionized by machines, others remained virtually untouched by technology. He pointed to the men's barber, who in 1948 cut just as many heads of hair per hour as he did in 1900. The tools might have changed slightly, but the fundamental process—the human hand moving the scissors through hair—remained constant.
Fourastié predicted that this divergence would lead to a gradual shift in the structure of the economy. He foresaw a "tertiarization," where the tertiary sector (services) would dominate the economic landscape.
The absolute volume of secondary production continues to grow; but from a certain state of economic development, the value of these growing productions diminishes in relation to the total volume of national production. Thus, tertiary values invade economic life; that is why it can be said that the civilization of technical progress will be a tertiary civilization.
Baumol and Bowen, in their original 1965 study, applied this logic to the performing arts. They argued that the "cost disease" was particularly acute in the arts because the product is the performance itself, which cannot be sped up. A symphony must take the time it takes. A play must run its full duration. Yet, to attract musicians and actors, theaters had to pay wages that tracked with the rest of the economy.
Critics have since pointed out nuances in this analysis. In 1984, Gambling and Andrews noted that productivity in the arts does increase with the size of the performance hall; a violinist playing to 2,000 people is more "productive" than one playing to 200. Greenfield added in 1995 that advances in recording, broadcasting, and amplification mean that one performance can be heard by millions, vastly increasing the effective output of the musician.
However, these adjustments do not negate the core phenomenon. The "live" experience, which is the primary product of the arts and many other services, remains constrained by human time. The recording can be copied infinitely, but the live concert cannot. The cost of the live performance, driven by the wages of the people providing it, still rises relative to the cost of manufactured goods. The "disease" is not that productivity is zero, but that it is significantly lower than the economy-wide average.
The Price of Progress
The consequences of the Baumol effect are visible in the price charts of the last century. In 2008, William Nordhaus, a Nobel laureate, conducted a massive study of price and productivity trends in the United States from 1948 to 2001. His findings were stark. He found that productivity trends were associated almost "percentage-point for percentage-point" with price decline.
Industries with low productivity growth saw their relative prices increase. Nordhaus concluded:
The hypothesis of a cost-price disease due to slow productivity growth is strongly supported by the historical data. Industries with relatively lower productivity growth show a percentage-point for percentage-point higher growth in relative prices.
The data confirmed the "stagnation hypothesis" as well. Technologically stagnant industries showed slower growth in real output than dynamic ones. For every one percentage-point higher productivity growth in a sector, there was a three-quarters percentage-point higher real output growth.
This creates a diverging economic reality. On one side of the ledger, we have the "progressive" sectors: electronics, manufacturing, agriculture. Here, goods become cheaper and more abundant. The cost of a computer, a car, or a loaf of bread drops relative to income. On the other side, we have the "stagnant" sectors: education, healthcare, legal services, and the arts. Here, the cost rises relentlessly.
This divergence explains why a family in 2026 can buy a car that is safer, faster, and more reliable than the one their grandparents bought in 1960, for a smaller fraction of their income. Yet, the same family finds that the cost of a college degree or a hospital stay has consumed a much larger share of their income, even though the "product"—the education or the medical procedure—has not necessarily become more "efficient" in terms of labor hours.
The implication is profound: increasing costs in labor-intensive service industries are not necessarily a result of inefficiency. They are a structural feature of a growing economy. When we see a doctor's bill rise, it is often because the doctor's salary had to rise to compete with the software engineer down the street, not because the doctor is taking longer to perform the surgery.
The Post-Industrial Shift and Government Spending
As the Baumol effect plays out, it reshapes the entire structure of employment. The share of total employment in sectors with high productivity growth decreases, while that of low productivity sectors increases. This is the definition of the transition to a post-industrial society.
Why does employment shift to the slower-growing sectors? Because as manufacturing becomes more efficient, fewer workers are needed to produce the same amount of goods. Those workers do not vanish; they move to the service sector. But because the service sector is less productive, it absorbs a growing share of the labor force.
This shift has a massive impact on government spending. Governments are disproportionately focused on the "stagnant" sectors: health, education, and law enforcement. Unlike a private manufacturer that can automate its way to lower costs, a government cannot easily automate the teaching of a classroom or the care of an elderly patient.
As wages in these sectors rise to match the rest of the economy, the cost of providing public services explodes. This is why government budgets face such relentless pressure. It is not necessarily that the government is becoming bloated or inefficient; it is that the cost of the labor required to run the government is rising faster than the tax base's ability to generate surplus through productivity gains in other sectors.
The result is a political and economic tension. Taxpayers demand high-quality services, but the cost of delivering those services is structurally rising. This often leads to calls for cuts, which can degrade the quality of service, or demands for higher taxes, which can stifle economic growth. It is a classic "cost disease" trap.
The Affordability Paradox
Perhaps the most troubling aspect of the Baumol effect is its interaction with income inequality. Baumol himself argued that "stagnant-sector services will never become unaffordable to society." His reasoning was optimistic: the economy's constantly growing productivity simultaneously increases the population's overall purchasing power. As long as the economy grows, the average person should be able to afford the rising cost of services because their income is rising in tandem with the productivity of the high-growth sectors.
However, this logic assumes a smooth distribution of the gains from productivity. In reality, income inequality has risen dramatically in recent decades. The workers in the high-productivity sectors (tech, finance, specialized manufacturing) have seen their wages soar, while the median wage has stagnated for many.
This creates a dangerous disconnect. Services whose prices rise faster than incomes can become unaffordable to many workers, even in a growing economy. A nurse in a stagnant sector may see their wages rise, but if they are competing for services like housing or education, which are also subject to Baumol effects, they may find themselves priced out. The "cost disease" becomes a barrier to entry for the middle class.
The rise of inequality has exacerbated this. When the gains from productivity are concentrated at the top, the average worker does not see the income growth necessary to keep up with the rising costs of the service sector. The result is a society where the "essential" services—health, education, childcare—become luxuries for the wealthy, while the "consumer goods"—phones, clothes, food—remain cheap and accessible.
This is a reversal of the industrial era logic. In the past, mass production made goods affordable for the masses. Today, the "mass production" of services is impossible. We cannot mass-produce a personal conversation between a teacher and a student, or a surgeon and a patient. We can only mass-produce the technology that supports them, which does not solve the labor cost problem.
The Future of the Stagnant Sector
What does the future hold? The Baumol effect suggests that the relative cost of services will continue to rise indefinitely, provided that technological progress continues in other sectors. We are moving toward a world where the majority of the economy is dedicated to services that cannot be easily automated.
Firms in these stagnant industries have a few options to respond to the rising costs. They can engage in "cost and price disease," where prices grow faster than average, passing the burden to consumers. They can accept "stagnant output," where real output grows more slowly relative to the overall economy. Or, they can reduce employment, decrease hours, or increase non-monetary compensation to keep costs down.
There is also the possibility of "Baumol's cure," which involves finding ways to increase productivity in the stagnant sectors. This is the holy grail of modern economics. Can we make education more efficient? Can we streamline healthcare? Can we use AI to do the work of a teacher or a lawyer?
If AI and automation can truly boost productivity in the service sector, they could break the Baumol effect. If an AI tutor can teach a thousand students as effectively as a human teacher, the cost of education could plummet. If an AI diagnostic tool can perform the work of a specialist, the cost of healthcare could drop.
But there is a catch. If AI replaces human labor in these sectors, we risk the very unemployment and inequality that the Baumol effect warns against. The workers displaced by AI in the service sector may not have high-productivity jobs to move to, as the high-productivity sector is also becoming more automated.
The challenge of the 21st century will be to harness the productivity gains of AI to lower the cost of services without destroying the livelihoods of the workers who provide them. We must find a way to distribute the gains of the "progressive" sectors to the "stagnant" sectors, ensuring that the rising cost of services does not lead to a crisis of affordability.
The Inescapable Truth
The Baumol effect is not a bug in the economic system; it is a feature. It is the natural result of a world where technology advances rapidly in some areas but remains static in others. It reminds us that not all value can be automated. The human touch, the live performance, the personal care, the face-to-face teaching—these are the things that define our quality of life, and they are the things that will always be expensive.
As we look at the economy of 2026, with its AI-driven productivity and its soaring service costs, the lesson of Baumol and Bowen is clear. We cannot blame inefficiency for the rising cost of a college degree or a hospital visit. We must recognize that these costs are the shadow cast by the light of technological progress. The challenge is not to stop the progress, but to manage the transition, to ensure that the benefits of the "progressive" sectors are shared broadly enough to pay for the essential services of the "stagnant" ones.
In the end, the cost disease is a testament to the value of human labor in a world of machines. As long as we value the human connection, the live performance, and the personal care, we will have to pay for them. And as long as we continue to innovate in other sectors, that price will only go up. The question is not whether we can afford it, but how we will organize our society to ensure that we all can.
Thus, the very progress of the technologically progressive sectors inevitably adds to the costs of the technologically unchanging sectors of the economy.
This is the inescapable truth of our economic reality. The violinist plays the same four movements as in 1820. The factory worker now produces a thousand times more. And the price of the concert ticket, driven by the factory worker's wage, climbs higher every year. It is the price of civilization, and it is a price we must be willing to pay.