In: Economics
Every consumer consumes because she gets utility from it. The utility is the numerical score assigned to the satisfaction a good provides to the consumer. A consumer chooses because she has a limited budget to purchase the required commodity in various quantities. There are two utility approaches to consumer theory: 1. Cardinal approach and 2. Ordinal approach.
From these assumptions, two theories emerge:
That is MUX/PX = MUY/PY and this is the condition for the maximization of consumer satisfaction.
Same condition is also followed from the ordinal approach which says that utilities can not be measured but ranked.