Income Elasticity of Demand

The concept

Income elasticity of demand measures how much the quantity demanded of a good changes when consumers' incomes change. The number tells you the type of good. Necessities have low elasticity (below 1): demand barely rises as incomes grow — think salt or basic soap. Luxuries and discretionary goods have high elasticity (above 1): demand jumps as people get richer — premium skincare, SUVs, branded foods. Inferior goods have *negative* elasticity: as incomes rise, people buy less of them, switching from the cheap option to a better one.

India's premiumisation story

This concept sits at the heart of India's biggest consumer trend. As incomes rise, Indians are "trading up" — buying premium versions across FMCG, beauty, autos, beverages and electronics. By 2025, premiumisation had shifted from a niche urban habit to mainstream behaviour, exactly what you would predict for high-income-elasticity categories.

The FMCG market shows both ends at once. Value-seeking persists in essentials and small entry-level packs (low-elasticity necessities for price-sensitive households), while steady premiumisation runs alongside it among middle and upper-income families (high-elasticity discretionary spending). The same shopper may buy a cheap detergent refill and a premium face serum.

What is fuelling it

The 2026 outlook for Indian FMCG points to high single-digit volume growth, supported by income-tax relief, RBI rate cuts that lift disposable income, and a good-monsoon rural recovery. Each of these raises incomes, and high-elasticity categories benefit the most.

Why it matters for investors

For anyone choosing consumption stocks or funds, income elasticity is a forecasting tool. In a rising-income economy like India, high-elasticity businesses — premium brands, discretionary retail, autos — should grow demand faster than staples. But the same property cuts both ways: in a downturn, discretionary demand falls hardest while necessities prove defensive. Knowing which side of the elasticity line a company sits on tells you how its sales will behave across the cycle.