Formula

Slope of an Indifference Curve

The slope of an indifference curve is derived by keeping utility constant. For small changes, the total change in utility is (U/t)dt+(U/c)dc=0(\partial U/\partial t) dt + (\partial U/\partial c) dc = 0. Rearranging this equation gives the slope of the indifference curve: dcdt=U/tU/c\frac{dc}{dt} = -\frac{\partial U/\partial t}{\partial U/\partial c}. Because the marginal utilities for desirable goods are positive (U/t>0\partial U/\partial t > 0 and U/c>0\partial U/\partial c > 0), the right-hand side of the equation is negative. This demonstrates that indifference curves for such goods are always downward-sloping.

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Updated 2026-05-02

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