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Marginal Rate of Technical Substitution (MRTS)

The rate at which one input can be substituted for another while maintaining a constant level of output. MRTSL,K=MPLMPK=−dKdL\text{MRTS}_{L,K} = \frac{\text{MP}_L}{\text{MP}_K} = -\frac{dK}{dL} along the isoquant.