Editing Implicit function (section)

===Marginal rate of technical substitution===

Similarly, sometimes the level set {{math|''R''(''L'', ''K'')}} is an [[isoquant]] showing various combinations of utilized quantities {{mvar|L}} of labor and {{mvar|K}} of [[physical capital]] each of which would result in the production of the same given quantity of output of some good. In this case the absolute value of the implicit derivative {{math|{{sfrac|''dK''|''dL''}}}} is interpreted as the [[marginal rate of technical substitution]] between the two factors of production: how much more capital the firm must use to produce the same amount of output with one less unit of labor.