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Implicit function
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===Marginal rate of substitution=== In [[economics]], when the level set {{math|1=''R''(''x'', ''y'') = 0}} is an [[indifference curve]] for the quantities {{mvar|x}} and {{mvar|y}} consumed of two goods, the absolute value of the implicit derivative {{math|{{sfrac|''dy''|''dx''}}}} is interpreted as the [[marginal rate of substitution]] of the two goods: how much more of {{mvar|y}} one must receive in order to be indifferent to a loss of one unit of {{mvar|x}}.
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