The natural rate of unemployment hypothesis was advocated by

1. Understanding Types of Unemployment (basic)

Hello! Welcome to your first step in mastering macroeconomics. To understand the health of an economy, we must first understand unemployment. Simply put, unemployment occurs when individuals who are actively seeking work and are willing to work at the prevailing wage rates are unable to find a job. It is not just about being 'out of work'—it specifically excludes those who are not looking for jobs, such as students or retirees.

In economics, we categorize unemployment based on its root cause. This helps policymakers decide whether they need to fix the education system, manage the business cycle, or simply wait for the market to adjust. Let’s look at the three primary types that define most modern economies:

Type	Nature	Primary Cause
Structural	Long-term	Mismatch between the skills workers have and the skills employers need, often due to technological shifts or changes in the economic structure Indian Economy, Nitin Singhania, Poverty, Inequality and Unemployment, p.50.
Frictional	Short-term	The time lag when people are between jobs, moving locations, or entering the workforce for the first time Indian Economy, Vivek Singh, Inclusive growth and issues, p.272.
Cyclical	Variable	Linked to the business cycle. It rises during recessions when demand for goods falls and decreases during economic booms Indian Economy, Vivek Singh, Inclusive growth and issues, p.272.

In the context of India, measuring this accurately is vital. Following the recommendations of the Prof. M.L. Dantwala Committee, the National Sample Survey Office (NSSO) uses three specific approaches to capture these nuances: Usual Principal Status (UPS), Current Weekly Status (CWS), and Current Daily Status (CDS) Indian Economy, Nitin Singhania, Poverty, Inequality and Unemployment, p.48. Each method provides a different 'lens'—for instance, UPS looks at the activity of a person over a year, while CDS captures the daily reality of underemployment.

Finally, we must recognize the Natural Rate of Unemployment. Popularized by Milton Friedman, this concept suggests that some level of unemployment (specifically frictional and structural) is 'natural' even when the labor market is in equilibrium. He argued that trying to push unemployment below this rate through monetary policy would only lead to higher inflation without long-term job gains Indian Economy, Nitin Singhania, Inflation, p. 71.

Sources: Indian Economy, Nitin Singhania, Poverty, Inequality and Unemployment, p.48; Indian Economy, Nitin Singhania, Poverty, Inequality and Unemployment, p.50; Indian Economy, Vivek Singh, Inclusive growth and issues, p.272; Indian Economy, Nitin Singhania, Inflation, p.71

2. The Basics of Inflation and its Measurement (basic)

Welcome back! Now that we understand the broad economic landscape, let’s zoom in on Inflation. At its simplest, inflation is a sustained increase in the general price level of goods and services in an economy over a period of time. It isn't just about one product getting expensive; it’s about your purchasing power eroding—basically, your 100-rupee note buying fewer apples today than it did last year.

In India, we primarily use two indices to track this: the Wholesale Price Index (WPI) and the Consumer Price Index (CPI). Think of WPI as the inflation felt by businesses at the factory gate or wholesale markets, while CPI is what you and I feel at the retail shop. A critical distinction is that WPI only tracks goods, whereas CPI tracks both goods and services (like education or healthcare) Indian Economy, Vivek Singh (7th ed.), Fundamentals of Macro Economy, p.33. Because CPI reflects the actual cost of living for citizens, the RBI uses CPI (Combined) as its primary anchor for monetary policy Indian Economy, Nitin Singhania, Inflation, p.68.

Feature	Wholesale Price Index (WPI)	Consumer Price Index (CPI)
Stage	Wholesale/Producer level	Retail/Consumer level
Composition	Goods only	Goods and Services
Food Weight	Lower (~22%)	Higher (~46%)
Base Year	2011-12	2012

Beyond these indices, economists often distinguish between Headline Inflation and Core Inflation. Headline inflation is the total inflation figure you see in the news, which includes everything. However, prices of food and fuel can be very "noisy"—they jump up and down due to a bad monsoon or global oil politics. To see the underlying, stable trend, policymakers look at Core Inflation, which is Headline inflation minus the volatile food and fuel components Indian Economy, Nitin Singhania, Inflation, p.69.

Sources: Indian Economy, Nitin Singhania, Inflation, p.68-69, 79; Indian Economy, Vivek Singh (7th ed.), Fundamentals of Macro Economy, p.33

3. The Original Phillips Curve: The Trade-off (intermediate)

The Phillips Curve is a fundamental concept in macroeconomics that explores the relationship between inflation and unemployment. First proposed by New Zealand economist A.W. Phillips in 1958, the theory suggests that there is a stable, inverse relationship between these two variables. In simpler terms, when unemployment is low, inflation tends to be high, and when unemployment is high, inflation tends to be low Nitin Singhania, Indian Economy, Chapter 4: Inflation, p. 71.

The logic behind this "trade-off" is rooted in the labor market. When the economy is booming and unemployment is very low, the labor market becomes "tight." Since workers are in high demand but short supply, they gain more bargaining power to demand higher wages. To maintain their profit margins, businesses pass these increased labor costs onto consumers in the form of higher prices, leading to wage-push inflation. Conversely, during a recession with high unemployment, workers have less bargaining power, wage growth slows down, and inflationary pressure subsides Vivek Singh, Indian Economy, Money and Banking- Part I, p. 113.

Economic Condition	Unemployment Rate	Inflation Rate	Reasoning
Economic Boom	Low	High	Tight labor market leads to rapid wage growth and higher prices.
Economic Recession	High	Low	Excess labor supply reduces wage pressure and slows price increases.

For decades, policymakers used the Phillips Curve as a "menu" for economic policy. It suggested that a government could choose a specific point on the curve: if they wanted lower unemployment, they had to be willing to accept a bit more inflation. However, this stable relationship was famously challenged in the 1970s during the era of stagflation, where both inflation and unemployment rose simultaneously, proving that the original curve might only hold true in the short run Nitin Singhania, Indian Economy, Chapter 4: Inflation, p. 74.

Sources: Indian Economy, Nitin Singhania, Chapter 4: Inflation, p.71, 74; Indian Economy, Vivek Singh, Money and Banking- Part I, p.113

4. Monetary Policy and Inflation Targeting in India (exam-level)

To understand how modern India manages its economy, we must look at the Flexible Inflation Targeting (FIT) framework. Before 2015, the RBI followed a "multiple indicator approach," juggling various goals like exchange rates and credit growth. Today, the focus is much sharper: the primary objective of monetary policy is to maintain price stability while keeping the objective of growth in mind Vivek Singh, Money and Banking- Part I, p.60.

Under the amended RBI Act of 1934, the Central Government, in consultation with the RBI, sets a specific inflation target every five years. Currently, that target is 4%, with a tolerance band of +/- 2% (meaning inflation should stay between 2% and 6%) Nitin Singhania, Inflation, p.73. The Consumer Price Index (CPI-Combined) serves as the "nominal anchor" or the yardstick used to measure this inflation. If the inflation remains outside this 2-6% range for three consecutive quarters, it is considered a failure of the mandate, and the RBI must report to the government explaining the reasons and the remedial actions planned Nitin Singhania, Money and Banking, p.172.

The decision-making power rests with the Monetary Policy Committee (MPC). This statutory body shifted the power of setting interest rates from just the RBI Governor to a collective group of experts, ensuring diverse perspectives. The composition is strictly balanced to maintain independence:

Feature	Details
Total Members	6 Members
RBI Internal	3 Members (Governor, Deputy Governor in charge of monetary policy, and one officer nominated by the Central Board)
Govt Appointed	3 External Members (Appointed for 4 years; not eligible for re-appointment)
Chairperson	RBI Governor (Ex-officio)
Voting	Each member has one vote; the Governor has a casting vote in case of a tie.

Nitin Singhania, Money and Banking, p.173

Sources: Indian Economy, Nitin Singhania, Money and Banking, p.172-173; Indian Economy, Nitin Singhania, Inflation, p.73; Indian Economy, Vivek Singh, Money and Banking- Part I, p.60; Indian Economy, Nitin Singhania, Financial Market, p.249

5. Labour Market Structure and PLFS Data (intermediate)

To understand how an economy is performing, we must look beyond just GDP and observe the Labour Market. This is where the supply of labor (workers) meets the demand for labor (employers). In India, our primary window into this market is the Periodic Labour Force Survey (PLFS), launched by the National Statistical Office (NSO) in 2017 to replace the older Employment-Unemployment Surveys Nitin Singhania, Poverty, Inequality and Unemployment, p.52. The PLFS was designed with a dual purpose: providing quick quarterly updates for urban areas to track short-term shifts, and comprehensive annual reports for both rural and urban areas to capture the structural health of our workforce Vivek Singh, Inclusive growth and issues, p.274.

When analyzing labour data, we use specific metrics that are often misunderstood. The Labour Force is not the entire population; it only includes those who are either working or actively seeking work. If someone is not looking for a job (like a full-time student or someone retired), they are not counted in the labour force. This gives us three critical ratios:

• Labour Force Participation Rate (LFPR): The percentage of the total population that is in the labour force.
• Worker Population Ratio (WPR): The percentage of the total population that is actually employed.
• Unemployment Rate (UR): Crucially, this is the number of unemployed persons divided by the Labour Force, not the total population Nitin Singhania, Poverty, Inequality and Unemployment, p.48.

The PLFS measures these using two different lenses: Usual Status (which looks at a person's activity over the last 365 days) and Current Weekly Status (CWS) (which looks at only the last 7 days). Usual Status helps us understand long-term employment trends, while CWS captures the more volatile, short-term changes in the economy Nitin Singhania, Poverty, Inequality and Unemployment, p.53.

Finally, it is vital to recognize that some unemployment is 'natural.' The Natural Rate of Unemployment, a concept championed by economist Milton Friedman, suggests that there is always a baseline level of unemployment caused by the microeconomic structure of the market (like people moving between jobs or skills not matching vacancies) Nitin Singhania, Inflation, p.71. Even when the economy is producing at its full potential, this natural rate persists, meaning policy makers shouldn't always aim for 'zero' unemployment, but rather for a rate that is consistent with stable inflation.

Metric	Formula	Significance
Labour Force	Employed + Unemployed (Seeking work)	Total human resource available for production.
Unemployment Rate	(Unemployed / Labour Force) × 100	Measures the gap between job seekers and job availability.
Worker Population Ratio	(Workforce / Total Population) × 100	Indicates the proportion of the population contributing to GDP.

Sources: Indian Economy, Nitin Singhania (ed 2nd 2021-22), Poverty, Inequality and Unemployment, p.52, 53, 48; Indian Economy, Vivek Singh (7th ed. 2023-24), Inclusive growth and issues, p.274; Indian Economy, Nitin Singhania (ed 2nd 2021-22), Inflation, p.71

6. Adaptive Expectations and the Long-Run Shift (exam-level)

In our previous discussions, we saw how the Phillips Curve suggests a trade-off: to get lower unemployment, we must accept higher inflation. However, as noted in Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.113, these implications are true only in the short term. To understand why this trade-off vanishes in the long run, we must look at Adaptive Expectations—the idea that people form their future expectations based on past experiences.

Imagine the government tries to push unemployment below its Natural Rate (the level consistent with a stable economy) by increasing the money supply. Initially, prices rise, but workers—acting on "Adaptive Expectations"—still expect the old, lower inflation rate. Because their nominal wages haven't caught up to the new prices yet, real wages fall. Firms find labor cheaper and hire more people, moving the economy up along the Short-Run Phillips Curve (SRPC). However, this is a temporary illusion. As workers eventually realize that their purchasing power has eroded, they demand higher wages to match the actual inflation. This increase in labor costs shifts the entire SRPC upward and to the right, much like how a simultaneous shift in supply and demand reaches a new equilibrium in microeconomic theory Microeconomics (NCERT class XII 2025 ed.), Market Equilibrium, p.79.

The result is a cycle: every time the government tries to trade more inflation for less unemployment, expectations eventually "catch up." In the long run, unemployment always gravitates back to its Natural Rate, regardless of the inflation level. This makes the Long-Run Phillips Curve (LRPC) a vertical line. This hypothesis, famously championed by Milton Friedman, argues that monetary policy cannot permanently pin unemployment below its natural level; it only succeeds in creating higher permanent inflation.

Feature	Short-Run Phillips Curve	Long-Run Phillips Curve
Shape	Downward Sloping	Vertical
Expectations	Workers' expectations lag behind actual inflation	Workers fully adjust expectations to actual inflation
Policy Result	Can reduce unemployment temporarily	Unemployment returns to the Natural Rate (NAIRU)

Sources: Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.113; Microeconomics (NCERT class XII 2025 ed.), Market Equilibrium, p.79

7. The Concept of NAIRU (exam-level)

The Non-Accelerating Inflation Rate of Unemployment (NAIRU) is a critical bridge between labor market health and price stability. To understand it, we must first look at the Phillips Curve, which originally suggested a simple trade-off: as unemployment falls, inflation rises, and vice versa Nitin Singhania, Inflation, p.71. However, economists like Milton Friedman and Edmund Phelps challenged this in the late 1960s. They argued that while this trade-off might exist in the short run, it disappears in the long run. In the long run, the economy gravitates toward a "natural rate" of unemployment determined by structural factors, such as labor market regulations and skill mismatches Nitin Singhania, Poverty, Inequality and Unemployment, p.50.

NAIRU represents the specific level of unemployment where the rate of inflation remains constant. If the government or central bank tries to push unemployment below this level (by stimulating the economy too much), it triggers a cycle where workers demand higher wages to keep up with rising prices, leading to accelerating inflation. Conversely, if unemployment is above the NAIRU, inflation tends to slow down (disinflation) because there is less pressure on wages Vivek Singh, Money and Banking- Part I, p.113. This concept explains why Stagflation — the rare combination of high inflation and high unemployment — can occur when the traditional trade-off breaks down Nitin Singhania, Inflation, p.74.

Scenario	Unemployment Rate	Impact on Inflation
Below NAIRU	Very low (Tight labor market)	Accelerates (Prices rise faster and faster)
At NAIRU	"Natural" level	Stable (Inflation rate does not change)
Above NAIRU	High (Excess labor supply)	Decelerates (Disinflation occurs)

Sources: Indian Economy, Nitin Singhania, Inflation, p.71; Indian Economy, Nitin Singhania, Inflation, p.74; Indian Economy, Nitin Singhania, Poverty, Inequality and Unemployment, p.50; Indian Economy, Vivek Singh, Money and Banking- Part I, p.113

8. Milton Friedman’s Natural Rate Hypothesis (exam-level)

To understand Milton Friedman’s Natural Rate Hypothesis, we first need to look at the traditional Phillips Curve. In the 1950s, economist A.W. Phillips suggested an inverse relationship between inflation and unemployment — implying that a government could 'buy' lower unemployment by accepting a bit more inflation Indian Economy, Nitin Singhania, Chapter 4, p. 71. However, in 1968, Milton Friedman challenged this, arguing that this trade-off is only a short-term phenomenon. He posited that there is a 'Natural Rate' of unemployment to which the economy will always return, regardless of the inflation rate.

Friedman’s logic was rooted in expectations. He argued that if the government uses expansionary policy to push unemployment below the natural rate, it creates inflation. Initially, workers are 'fooled' by higher nominal wages and take up jobs. But eventually, they realize that their real purchasing power hasn't increased because prices have also risen. They then demand higher wages to compensate, firms' costs go up, and they begin laying off workers again. The result? The economy ends up back at the Natural Rate of Unemployment, but with a permanently higher level of inflation. This implies that in the long run, the Phillips Curve is vertical.

The 'Natural Rate' is not zero; it represents the level of unemployment consistent with a stable inflation rate and a labor market in equilibrium. It is determined by the structural features of the economy, such as labor market flexibility, the efficiency of job-matching, and structural unemployment caused by skill mismatches Indian Economy, Nitin Singhania, Chapter 5, p. 50. While monetary policy can cause temporary fluctuations, it cannot keep unemployment below this natural level indefinitely without causing spiraling inflation.

Feature	Short-Run Phillips Curve	Long-Run (Natural Rate)
Trade-off	Exists (Inverse relationship)	No trade-off exists
Shape of Curve	Downward sloping	Vertical line
Role of Expectations	Expectations are static/slow	Expectations adjust to actual inflation

Sources: Indian Economy, Nitin Singhania, Chapter 4: Inflation, p.71; Indian Economy, Nitin Singhania, Chapter 5: Poverty, Inequality and Unemployment, p.50

9. Solving the Original PYQ (exam-level)

Now that you have mastered the dynamics of the Phillips Curve and the trade-off between inflation and unemployment, this question brings those building blocks together. The concept of the Natural Rate of Unemployment represents a pivotal shift from the Keynesian view to the Monetarist perspective. To solve this, you must recall that while early economists saw a permanent menu of choices between inflation and jobs, later thinkers argued that there is a structural level of unemployment—determined by labor market frictions—that the economy naturally gravitates toward in the long run. This "natural" level is immune to monetary policy in the long term, forming the basis of the Long-Run Phillips Curve.

To arrive at the correct answer, look for the economist who challenged the status quo in the late 1960s. Milton Friedman famously argued that workers and firms eventually adjust their expectations to inflation, meaning any attempt to keep unemployment below this natural threshold would only lead to accelerating inflation. This reasoning directly identifies (A) Milton Friedman as the correct choice. As noted in Indian Economy by Nitin Singhania, Friedman’s hypothesis fundamentally changed how central banks approach monetary policy by highlighting that policy cannot permanently "buy" lower unemployment through higher inflation.

UPSC often uses the other names as traps to test the precision of your historical knowledge. A. W. Phillips and R. G. Lipsey are common distractors because they are indeed associated with the Phillips Curve, but they focused on the inverse relationship (the trade-off) rather than the hypothesis that a natural rate exists to limit it. Similarly, J. M. Keynes represents the school of thought that believed active government intervention could manage demand to solve unemployment, which is the very idea the natural rate hypothesis sought to critique. Distinguishing between the originator of a curve and its critic is a key skill for success in the Economics section.