AAbe and Mary both purchase corn chips and chocolate milk at their friendly neighborhood convenience store. The two friends have different tastes for corn chips and chocolate milk and they end up purchasing very different quantities of the two commodities. Nevertheless, they have the same marginal rate of substitution of chocolate milk for corn chips. Explain how this is possible
Commodities are bought in quantities where marginal rate of substituion(MRS) equals the price ratio of the commodities. Here MRS is equal for two buys but quantities are diffrent, This, implies the ratio of prices of the two goods faced is different for the two. The concept of price discrimintion tells us two consumers can face different prices on same good based on their location maximum willingness to pay and elasticity of their demand. Thus, ratio of price of corn chips to chocolate milk is different for AAbe and Mary, thus they end up buying different quantities.
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