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Assuming that only two goods the consumer consumes are X and Y, the conditions of equilibrium are:

(i) MUx/Px= MUy/Py =MU 

(ii) MU falls as more is consumed.

(a) Suppose MUx/Px> MUy/Py. The consumer will not be in equilibrium because per rupee MU of X is greater than per rupee MU of Y. This will include the consumer to buy more of X by reducing expenditure on Y. It will lead to fall in MUx and rise in MUy. This will continue till MUx/Px=MUy/Py

(b) Unless MU falls as more of a good is consumed the consumer will not reach equilibrium.

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