3 MRS conditions for Cobb Douglas, Perfect Complements and Perfect Substitutes


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In the following videos, we try to find MRS for several utility functions, say, cobb douglas, perfect complements, perfect substitutes. MRS calculates the rate at which one good is substituted for another, keeping utility constant. MRS for Cobb Douglas changes at every point along an indifference curve. MRS for perfect complements is same along a vertical or horizontal strip, while it is not defined at the kink. In case of perfect substitutes, MRS is same along the entire indifference curve.

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MRS of perfect complements


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Derive the MRS in case of perfect complements

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2 concepts related to Marginal Utility


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We will discuss two concepts related to marginal utility. Firstly, if you are given any utility function, how do you derive marginal utility of a commodity from it. Secondly, how can you derive marginal rates of substitution from marginal utilities. These concepts will help you in understanding theoretical background related to these two important basic concepts and then you will be able to apply it to any specific utility function. Continue reading

5 Basic questions of Introductory Consumer Theory


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In the following videos we try look at five most basic questions of introductory consumer theory. We try to answer, when is the consumer rational? What are the different axioms which consumer preferences should satisfy for preferences to be rational?

Then, we look at what is utility? Can utility be represented by a number or it is only rank-based (ordinal)? We find that utility is ordinal. Continue reading

How would you derive MRS from MU


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Marginal rate of substitution (y for x) is the amount of y, individual gives up, for one more additional unit of x.  MRSyx is the ratio of marginal utilities of x and y Continue reading