5 Nobel Laureates in Economics
1. Paul Krugman (2008)
Background
Paul Krugman is an American economist, author, and public intellectual known for his work in
international economics and trade theory. He is one of the most famous living economists,
known for his ability to translate complex economic models into clear language for the general
public. His work revolutionized how we think about globalization, explaining why similar
countries (like the US and Canada) trade similar products (like cars) with each other.
Thesis
For over a century, trade theory (Comparative Advantage) argued that countries only trade
because they are different (e.g., one has oil, the other has wheat). Krugman’s argument was
that trade also happens because of Economies of Scale and a consumer's desire for variety.
He proved that even if two countries are exactly the same, they will still benefit from trading
because it allows firms to produce at a larger, more efficient scale while giving consumers
more choices.
Theory
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New Trade Theory (1979): Krugman modeled trade using a "monopolistic
competition" framework. He assumed that firms produce differentiated products (a
BMW is not a Mercedes, which is not a Toyota), that there are economies of scale in
production, and that consumers prefer variety. Under these assumptions, even two
identical countries will benefit from trading because:
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Larger markets allow firms to produce at lower average cost.
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More firms enter the market, increasing product variety.
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Increased competition drives prices down.
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Consumers get both lower prices and more choices.
This theory explained for the first time why 60% of world trade is "intra-industry trade"—
countries exporting and importing the same categories of goods. The classic example:
the U.S. exports cars to Japan and imports cars from Japan.
•
New Economic Geography (1991): Krugman then extended the same logic to explain
where economic activity locates. Why do so many people and businesses cluster in a
few big cities (the "core") while other regions remain rural and poor (the "periphery")?
He added two elements to his trade model: transportation costs and worker mobility.
The result is a powerful explanation for urbanization and regional inequality. Firms
want to locate where the customers are (to save on shipping). Workers want to live
where the jobs are. This creates a self-reinforcing cycle: more firms attract more
workers, which attracts more firms. Once a region becomes the "core," it tends to stay
that way—even if other locations might have been equally good starting points. This
work essentially created the field of "economic geography" within mainstream
economics.
Supervisor
PhD University: Massachusetts Institute of Technology (MIT)
Supervisor: Rüdiger Dornbusch—Krugman called him "one of the great economics
teachers of all time"
Thesis Area: "Essays on Flexible Exchange Rates" (1977).
Unique Fact
The core ideas of his Nobel Prize were first presented in a 1979 paper that was just 10 pages
long. He wrote that "I knew within a few hours that I had the key to my whole career in hand."
2. Amartya Sen (1998)
Background
Amartya Sen is a world-renowned economist and philosopher who has taught at both Oxford
and Cambridge in the UK and Harvard in the USA. He is credited with restoring an ethical
dimension to the discussion of vital economic problems. His work challenged the purely
mathematical approach to economics by reintegrating social welfare and human rights into
the core of the field.
Thesis
For years, economists measured a country's success by its GDP per capita. They believed
that famine was caused by a lack of food, and that poverty was simply a matter of low income.
Sen's Nobel-winning thesis was that development is not about goods—it is about people. He
argued that poverty is not just a lack of money; it is a lack of capabilities—the real freedom
that people have to choose the lives they want to live. A person may have a high income but
still be unfree if they lack healthcare, education, or political rights. This shifted the entire focus
of development economics away from wealth and toward well-being.
Theory
He revolutionized development economics and social choice theory:
The Capability Approach: Instead of looking at what people own, we should look at what
they are capable of doing.
Example: Two people might have the same income, but if one has a physical disability or
lives in a war zone, their "capability" to function is much lower.
Poverty and Famines: He famously proved that famines are often not caused by lack of
food, but by lack of access to food —meaning people lose the legal or economic means to
command the food that is already available. People starve because they cannot afford food,
not because food doesn’t exist.
Social Choice Theory: He developed mathematical methods to determine how individual
preferences can be combined into a collective decision for the "good of society" without
violating individual rights.
Supervisor
PhD University: University of Cambridge
Supervisor: Joan Robinson
Thesis Area: Welfare economics and social choice theory
Unique Fact
Joan Robinson, his supervisor, told him after reading only the first two chapters that she would
not read the rest because it was "not worthy" of him. She approved his PhD anyway, but made
him promise he would "come back to real economics someday.
Sen’s ideas heavily influenced the creation of the Human Development Index by the United
Nations Development Program. HDI Measures development using education, life expectancy,
and income. It Provides a broader view than GDP alone.
3. George A. Akerlof (2001)
Background:
Akerlof is a professor at Georgetown University and a professor emeritus at the University of
California, Berkeley. He is known for integrating sociology and social psychology into
economic theory. His work often focuses on how individual identity and social norms influence
economic outcomes.
Thesis:
For a long time, economists assumed that in any transaction, both the buyer and the seller
had the same information. Akerlof’s Nobel-winning contribution was proving the existence of
Information Asymmetry—the idea that one party (usually the seller) often knows more about
the quality of a product than the other. This imbalance can cause markets to malfunction or
collapse entirely.
Theory:
He revolutionized the study of markets with his "Information" theory:
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The Market for Lemons: Using the used-car market as an example, he explained that
sellers of low-quality cars ("lemons") know their cars are bad, but buyers cannot tell.
Because buyers fear getting a "lemon," they only offer a low average price.
•
Market Collapse: Since owners of high-quality cars ("peaches") won't sell for a low
"average" price, they leave the market. Eventually, the market is left only with "lemons."
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Solutions: This theory explains why we need brand names, warranties, and
professional licensing—these are tools to bridge the information gap between sellers
and buyers.
Supervisor:
PhD University: Massachusetts Institute of Technology (MIT)
Supervisor: Robert Solow (Another Nobel Laureate)
Thesis Area: Macroeconomics and Economic Growth
Unique & Interesting Facts:
When Akerlof first submitted his "Market for Lemons" paper to academic journals, it was
rejected three times. One journal editor even told him the idea was "too trivial" to publish.
Today, it is one of the most cited and influential papers in the history of economics.
4. Richard Thaler (2017)
Background
For much of the 1980s and 90s, Thaler was considered a "radical" or even a "heretic" by the
Chicago School of Economics. Traditionalists argued that his observations were just
"anomalies" that didn't matter in the grand scheme of the market. However, Thaler began a
series in the Journal of Economic Perspectives titled "Anomalies," where he systematically
documented cases where market behavior defied traditional logic. Eventually, the evidence
became too large to ignore, and he is now revered as the "Father of Behavioral
Economics.".
Thesis
For decades, traditional economics was built on the idea that humans are logical beings who
always make decisions to maximize their own wealth. Thaler’s Nobel-winning contribution was
proving that humans are not always rational; we are deeply irrational, but in predictable ways.
Emotions, biases, and habits influence financial decisions.
Theory
He integrated insights from psychology into economic analysis.
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Mental Accounting: People simplify financial decision-making by creating separate
accounts in their minds (e.g., a "vacation fund" vs. "rent money").
Example: People might carry high-interest credit card debt while simultaneously
keeping money in a low-interest savings account. Logically, they should pay off the
debt, but "mentally," those piles of money belong to different categories.
•
Nudge Theory: He proposed that because people are lazy or prone to
procrastination, the "choice architecture" should be designed to help them.
Example: Instead of asking employees to "opt-in" to a pension plan, companies should
"opt-out" employees by default. This simple "nudge" massively increased retirement
savings rates worldwide.
Supervisor
PhD University: University of Rochester
Supervisor: Sherwin Rosen
Thesis Area: Behavioral decision-making and economics
Unique & Interesting Facts
he won the Nobel Prize in 2017 and was asked how he would spend the $1.1 million prize
money, he famously replied: "I will try to spend it as irrationally as possible!"
5. Milton Friedman (1976)
Background
Friedman became the most influential advocate for free-market capitalism in the 20th century.
He led the "Chicago School" of economics, which challenged the then-dominant Keynesian
views that governments should actively "manage" the economy by spending and borrowing.
He spent his career arguing that government intervention often does more harm than good
and that individual freedom is inseparable from economic freedom.
Thesis
Traditional Keynesian economics argued that government spending was the key tool to
manage economic cycles. Friedman’s Nobel-winning contribution was demonstrating that
control of the money supply is the most important factor in managing inflation and economic
stability. He argued that inflation is always a monetary phenomenon—caused by too much
money in the economy.
When the 1970s proved him exactly right, his thesis became undeniable. He argued that the
Great Depression was not a failure of capitalism, but a failure of the central bank to manage
the money supply correctly.
Theory
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Monetarism: Friedman argued that controlling money supply is key to managing
inflation. Central banks should control the growth of the money supply rather than rely
on fiscal policy. He believed that steady, predictable increases in money supply lead
to stable economic growth. Excessive money printing leads to inflation.
Example: If a government prints too much money, people will have more cash to
spend, but goods and services remain the same—so prices rise (inflation).
•
Permanent Income Hypothesis: Friedman proposed that people base their
consumption not just on current income, but on their expected long-term average
income.
Example: If someone receives a bonus, they are unlikely to spend all of it immediately
because they see it as temporary income. Instead, they smooth their spending over
time.
Supervisor
PhD University: Columbia University
Supervisor: Simon Kuznets (who later won the Nobel Prize himself in 1971)
Thesis Area: Income distribution and professional practices
Unique Fact
He also advised U.S. President Ronald Reagan and UK Prime Minister Margaret Thatcher,
shaping global economic reforms.