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## MRS and Special utility functions

Marginal Rate of Substitution (MRS):U = U(x, y). Totally differentiating to get d U = MU

_{x}dx + MU_{y}dy = 0 (why?).cf) Can you depict an indifference curve with increasing MRSx, y ?

:Special Utility FunctionsCobb-Douglas Utility Function (by Charles Cobb and Paul Douglas 1928)

U = Ax

^{α}y^{β}, where A, α , and β are positive constants.Cobb-Douglass efficacy function has three properties that make it of interest in the study of consumer choice.

i) MU’s are positive Check it out.

ii) Since MU’s are all positive the apathy curves will be downward sloping.

iii) It also exhibits a diminishing MRS

Quasi-Linear Utility Function (imperfect substitution, No income effect on x) It can describe preferences for a consumer who purchases the same amount of a commodity regardless of his income. Ex) toothpaste and coffee U(x, y) = v(x) + by , where v(x) is a function that increases in x and b is positive constant. The indifference curves are parallel so for any value of y the slopes of I.C. will be the similar.

U = √x + y

:Budget ConstraintP

_{x}x + P_{y}y ≤ M From this constraint we can derive the budget line (or price line) to visualize in 2-D space.where - P

_{x}/P_{y}is slope and M/P_{y}is vertical intercept.Latest technology based Microeconomics Online Tutoring AssistanceTutors, at the

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