If the percentage change in quantity demand is less than the percentage change in income is known as income elasticity of demand less than one.
For example, change in demand by 5% due to change in income by 10%.
On the above figure, initial income is OI and quantity demand is OQ. When income increases from I to I1 by 10% then demand increases from Q to Q1 by 5%. This is known as elasticity of demand less than one.
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