The marginal rate of substitution for consumer A between good 1 and good 2 at the Pareto optimal allocation is -3.
This means that consumer A is willing to give up 3 units of good 2 to obtain 1 unit of good 1.
The quantity of a good that a customer is prepared to consume in comparison to another good, provided that the new item is equally fulfilling, is known as the marginal rate of substitution (MRS) in economics. The indifference theory use MRS to examine customer behaviour.
For example, if a consumer is willing to give up 6 bananas in exchange for 3 apples, the MRS = -6 / 3 = -3.
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