Starting from the initial situation of consumer's equilibrium, suppose that the marginal utility of a rupee increase. Will it increase or decrease the quantity demanded of a product?
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Solution
Consumer's equilibrium is struck when: MUXPX=MUM A rise in MUM implies that MUXPX<MUM.
If PX
is constant, MUX must rise for the equilibrium to be resorted. MUX will rise only if quantity demand of X decreases (in accordance with the law of diminishing marginal utility).