If a good is a perfect substitute, then the MRS will be constant no matter how much of any one good the consumer possesses.

Name: If a good is a perfect substitute, then the MRS will be constant no matter how much of any one good the consumer possesses.
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If a good is a perfect substitute, then the consumer is willing to trade it for any other good at a fixed ratio. Therefore, the marginal rate of substitution will remain constant, regardless of how much of either good the consumer possesses.

If a Good Is a Perfect Substitute, Then the MRS