Yaar, to an uncle like me on a fixed pension, that sounds like fancy maths for "stretch your rupee so you don't feel the pinch." It just means you balance your joy from each thing you buy with its price, so you’re at peace.
My life says the real 'indifference curve' is between good ghee and my heart pills – the doctor's price is fixed, so my satisfaction is balancing on a knife's edge!
The big book answer forgets the main rule: some needs have no substitute. You can't swap your medicine for more sugar, no matter what the ratio says.
#cost-of-living#budget
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