What Is an Interior Solution?

An interior solution is a choice made by an agent that can be characterized as an optimum located at a tangency of two curves on a graph.

A classic example of an interio solution is the tangency between a consumer's budget line (characterizing the maximum amounts of good X and good Y that the consumer can afford) and the highest possible indifference curve. The slope of that tangency is where:

(marginal utility of X)/(price of X) = (marginal utility of Y)/(price of Y)

Contrast interior solution with corner solution. (Econterms)

Terms related to Interior Solution:

  • Corner solution

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Beggs, Jodi. "What Is an Interior Solution?" ThoughtCo, Jan. 29, 2020, thoughtco.com/what-is-an-interior-solution-4082800. Beggs, Jodi. (2020, January 29). What Is an Interior Solution? Retrieved from https://www.thoughtco.com/what-is-an-interior-solution-4082800 Beggs, Jodi. "What Is an Interior Solution?" ThoughtCo. https://www.thoughtco.com/what-is-an-interior-solution-4082800 (accessed March 27, 2023).