The marginal rate of substitution reflects how much input A will need to be increased to offset a decrease in a unit of input B.

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The marginal rate of substitution (MRS) measures the rate at which one input can be substituted for another while keeping the level of output constant. It is calculated as the ratio of the change in input A to the change in input B that results in no change in output. Therefore, the MRS reflects how much input A will need to be increased to offset a decrease in a unit of input B.

The Marginal Rate of Substitution Reflects How Much Input a Will