✅Correct answer: Essential consumer goods
Unit I: Business Management and Managerial Economics
Topic: Demand analysis: Elasticity
📖 Explanation:
Income elasticity of demand measures the responsiveness of demand to changes in consumer income.

The question asks for goods whose demand increases rapidly when income rises initially but then increases at a slower rate as income continues to rise. This is a characteristic of essential consumer goods (necessities).
Essential consumer goods (0 < YED < 1)
Reason: These goods have positive but less than unitary income elasticity (0 < YED < 1). As income rises, demand increases, but proportionately less than the increase in income because basic needs eventually become satisfied.
❌ Why the other options are incorrect:
Inferior goods (YED < 0)
Reason: Inferior goods have negative income elasticity (YED < 0). As income rises, consumers purchase less of these goods and switch to better-quality substitutes.
Example: Coarse grains, low-quality transport, generic products.
Normal goods (YED > 0)
Reason: Normal goods have positive income elasticity (YED > 0). However, this category includes both necessities and luxuries. Since the question specifically describes demand increasing and then slowing down with higher income, necessities (essential consumer goods) are the more precise answer.
Luxury and prestige goods (YED > 1)
Reason: Luxury goods have income elasticity greater than one (YED > 1). Demand increases more than proportionately as income rises.
Example: Luxury cars, designer watches, premium vacations.
✅ Final Answer: Essential consumer goods.