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Reviewed by Casa Academy and updated July 29, 2026 using the current DBPR checklist and Pearson VUE scheduling guidance.

Principle of Substitution

The principle of substitution states that a prudent buyer will not pay more for a property than the cost of acquiring an equally desirable substitute property, anchoring the sales comparison and cost approaches to competitive alternatives in the market.

Exam context

Substitution limits value to cost of equally desirable alternative. Supports sales comparison approach. Buyer chooses lower cost substitute with same utility. Related to competition in market value definition.

Market behavior

If two similar homes are listed, buyers negotiate the cheaper option unless the other offers compensating advantages. Appraisers rely on substitution when selecting comps with similar utility. Cost approach assumes a buyer would not pay more than rebuild cost minus depreciation for an existing structure.

New construction competition

Existing home sellers compete with new builds offering warranties and customization. Substitution caps prices in oversupplied markets. Agents use substitution logic in pricing consultations by referencing active substitutes, not distant aspirational sales alone.

Examples

  • Competing subdivisions

    A resale listing at $410,000 stalls when a builder offers a similar new home at $399,000 with incentives, demonstrating substitution pressure.

  • Appraisal comp grid

    The appraiser values the subject near adjusted comp prices because a buyer could purchase those substitutes instead of paying a premium for the subject.

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