Definition
Market value is the price at which property, goods, or securities would change hands between a willing buyer and a willing seller, neither acting under compulsion and both having reasonable knowledge of the relevant facts. It is the price that the open market would produce — not what a particular buyer urgently needs to pay, nor what a particular seller desperately needs to accept.
In practice, market value operates across several legal contexts:
(1) Property and real estate: The price a piece of real property would command on the open market in an arm's-length transaction. This is the standard measure in eminent domain proceedings, tax assessments, and mortgage lending.
(2) Personal property and goods: The prevailing price at which goods of a given kind and quality are sold through ordinary commercial channels. Historical sources emphasize public sales and the general trade price — not the idiosyncratic value to a specific buyer or seller.
(3) Securities and financial assets: The current trading price on an organized exchange, or, where no active market exists, the price a reasonable, informed purchaser would pay.
Across all three contexts, the core concept is consistent: an objective, externally verifiable price derived from the market itself, not from subjective need, special relationships, or forced transactions.
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Common Language
Modern common usage (Wiktionary): "The price which a seller or insurer might reasonably expect to fetch for goods, services or securities on the open market."
Historical common usage (Webster's 1913): Not materially different from modern usage; the concept of a prevailing open-market price has been stable in ordinary speech.
Editorial note: The common and legal definitions align closely at a surface level, but legal market value is more structurally demanding than ordinary usage suggests. The law insists on specific conditions — no compulsion on either side, reasonable knowledge, arm's-length dealing — that ordinary speech leaves unstated. When a homeowner says their house has a certain "market value," they may be including emotional premium or unique buyer interest; the legal standard strips those out.
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Common Confusion
Market value is frequently used interchangeably with fair market value in legal sources, and the two terms are functionally synonymous in most contexts. The word "fair" was added over time to underscore the absence of compulsion and the requirement of informed parties — it is a gloss on the same concept, not a distinct standard. Researchers should not treat a source's choice between the two phrases as signaling a substantive difference unless the governing statute or court opinion explicitly defines them separately.
Market value is also sometimes confused with assessed value (the value assigned by a taxing authority for property tax purposes) and appraised value (an expert's estimate of market value). Neither is the same thing. Assessed value is a governmental determination that may be set below market value by statute or formula. Appraised value is an opinion evidence of market value, not market value itself.
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Why It Matters in Research
The term appears across an unusually wide range of legal contexts — eminent domain, tax law, insurance, commercial sales, secured lending, and tort damages — and the standard is not always applied identically across those fields. A researcher who finds a strong definition of market value in an insurance case should not assume it maps cleanly onto the eminent domain standard.
In eminent domain research, fair market value is the constitutional floor for just compensation, and there is a rich body of doctrine on what comparables are admissible, how to value property with no active market, and how to handle special-use property. That body of law is largely distinct from commercial sales cases.
In historical sources, market value for goods was closely tied to trade price at a recognized market or exchange — a concept rooted in physical market places and commodity trading. That context matters when reading nineteenth-century cases involving import duties, cargo valuation, or breach of contract damages. Bouvier's entry reflects this older commercial framing; its cases concern merchandise prices, not real property.
Watch for shifting terminology in older sources: market value, market price, fair market value, cash market value, and sound market value all appear in historical case law, sometimes as synonyms and sometimes as distinct standards. Always check whether the source document defines its own term.
Jurisdictional variation in anti-deficiency statutes is a significant trap. In states with such statutes, a lender's deficiency claim after foreclosure may be limited by the property's fair market value at the time of sale — meaning the legal market value determination directly affects what debt remains collectible.
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Historical Dictionary Support
Bouvier's defines market value for goods as "a price established by public sales, or sales in the way of ordinary business" and notes that the general market value governs without regard to special advantages enjoyed by a particular importer. Bouvier's goes further than most modern definitions in flagging that cost of production may be considered in certain circumstances — a point that still surfaces in customs and import valuation disputes.
The Bouvier's definition is commercially oriented and focused on tangible goods. It does not address real property valuation, the willing-buyer/willing-seller framework, or the constitutional dimensions of fair market value that dominate modern legal usage. Researchers using Bouvier's as a starting point should treat it as a foundation for commercial and goods-related valuation, not as a guide to eminent domain doctrine.
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Jurisdictional Note
Most U.S. jurisdictions use the willing-buyer/willing-seller standard for eminent domain just compensation, but the details of what evidence is admissible to prove that value vary by state. Several states have codified the fair market value standard in their eminent domain statutes with specific definitions that may differ from the common law formulation. International and cross-border contexts introduce additional variation, particularly in customs and excise valuation, where statutory definitions of "transaction value" and "dutiable value" may depart from ordinary market value analysis.
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Encyclopedia Cross-Reference
Eminent Domain — Just Compensation (Fair Market Value Standard), The Law Mind Property Law Encyclopedia.
Deficiency Judgments — Availability, Anti-Deficiency Statutes, and Fair Market Value Limitations, The Law Mind Real Estate Transactions & Construction Encyclopedia.
Negligence — Damages — Future Damages and Present Value, The Law Mind Torts & Personal Injury Encyclopedia.
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