From the diagram we can see that, initially without any tax the original choice of a consumer is at point A on IC1, the highest IC.
But after the proportional tax, budget line pivot and new bundle is at point B on IC2, on the lower IC than before. consumption bundle decrease.
But due to imposition of income tax, money income decrease, but consume shift on the higher IC at IC3.
He is better off in income tax than in proportional tax, bcoz in proportional tax, his original bundle deteriorates, but in income tax his consumption doesn't deteriorates and he can achieve maximum satisfaction on higher IC.
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