Marginal rate of product substitution (MRPS):
•MRPS refers to the absolute change in one product associated with a change of one unit in competing product. The quantity of one product to be sacrificed so as to gain another product by one unit in called MRPS.
•MRPS= number of units of replaced product/number of units of added product
•MRPS Y2Y1= Δy1/Δy2


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