NAIRU

## What it is NAIRU stands for the Non-Accelerating Inflation Rate of Unemployment. It is the theoretical unemployment rate at which inflation neither rises nor falls — the economy's "sustainable" level of joblessness. The idea: if unemployment falls *below* NAIRU, the labour market overheats, wages and prices accelerate, and inflation rises; if unemployment is *above* NAIRU, there's slack, and inflation eases. It is the modern, expectations-based refinement of the Phillips curve and is sometimes called the "natural rate of unemployment."

## Why central banks care NAIRU is a key (if unobservable) input into monetary policy. Central banks try to keep the economy near NAIRU — enough employment without triggering an inflation spiral. When they judge unemployment has fallen below NAIRU, they tend to tighten policy (raise rates) to cool demand; when slack is large, they can ease without stoking inflation. The catch is that NAIRU cannot be measured directly — it has to be estimated, and those estimates shift over time, making it a famously slippery guide.

## The Indian context NAIRU is harder to apply in India than in advanced economies:

- India's labour market is overwhelmingly informal, and unemployment data (from PLFS) is less tightly linked to wage-price dynamics than in rich economies, so the textbook NAIRU mechanism is weak. - India's inflation is driven heavily by food and fuel supply shocks (monsoon, global crude), not just labour-market tightness — so the RBI frames policy more around its CPI inflation target of 4% (±2%) and output gap than around an explicit NAIRU. - Still, the underlying concept — that demand running ahead of the economy's capacity feeds inflation — informs how the Monetary Policy Committee reads the cycle.

## Why a mutual-fund investor should care NAIRU is part of the logic that sets interest rates, which drive both bond and equity markets:

- If the RBI believes the economy is running hot (effectively below "full capacity"), expect rate hikes — pressure on debt-fund NAVs (yields up) and on rate-sensitive equity sectors. - If there's slack, expect rate cuts or pauses — supportive for duration debt funds and rate-sensitive stocks.

Bottom line: NAIRU is a conceptual anchor for thinking about how far an economy can grow before inflation bites. In India its direct use is limited by an informal labour market and supply-driven inflation, but the broader idea helps investors interpret RBI policy and position across equity and debt through the cycle.