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Utility
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=== Marginal rate of substitution (MRS) === Marginal rate of substitution is the absolute value of the slope of the indifference curve, which measures how much an individual is willing to switch from one good to another. Using a mathematic equation, <math>MRS=-\operatorname{d}\!x_2/\operatorname{d}\!x_1</math>keeping ''U''(''x''<sub>1</sub>,''x''<sub>2</sub>) constant. Thus, MRS is how much an individual is willing to pay for consuming a greater amount of ''x''<sub>1</sub>. MRS is related to marginal utility. The relationship between marginal utility and MRS is:<ref name=":1" /> : <math>MRS=\frac{MU_1}{MU_2}</math>
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