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  • Marginal Rate of Substitution (MRS)

  • Assumptions about Preferences in Indifference Curve Analysis

  • Diminishing Marginal Utility

  • Relationship between Relative Scarcity and the Marginal Rate of Substitution

Diminishing Marginal Rate of Substitution

The principle of diminishing marginal rate of substitution (MRS) posits that as an individual has more of one good relative to another, their willingness to trade away a unit of the scarcer good for an additional unit of the abundant good decreases. This phenomenon is a direct result of diminishing marginal utility; as the quantity of a good increases, the extra satisfaction (marginal utility) gained from one more unit falls. Consequently, the individual values the abundant good less at the margin, leading to a lower MRS and flatter indifference curves. This characteristic is what gives indifference curves their typical convex shape.

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