Definition
A Latin term from Roman law meaning merchandise, goods, wares, or commodities — specifically, movable articles that are bought and sold in trade. Merx appears in legal sources primarily as a term of art in discussions of contract law, commercial law, and the law of sale, where it denotes the subject matter of a commercial transaction.
The classical maxim associated with the term is: Merx est quicquid vendi potest — "Merchandise is whatever can be sold." This formulation reflects the broad scope of the concept in Roman and civil law: anything capable of being an object of sale qualifies as merx. It is a foundational concept in the civil law of emptio venditio (the contract of sale), where merx designates the thing sold, as opposed to the pretium (the price paid).
Why It Matters in Research
Researchers will encounter merx almost exclusively in two contexts: civil law treatises and glossaries, and older Anglo-American commercial law sources that drew on Roman law foundations. The term is rarely operative in modern common law case law, but it surfaces in historical discussions of what constitutes "goods" or a "commodity" under early sale and trade law.
The maxim Merx est quicquid vendi potest has historical significance beyond its brevity. Courts and commentators invoked it to argue for a broad definition of merchantable goods — a lineage traceable through civil law into early common law commercial doctrine. Researchers tracing the history of "goods" under sale-of-goods law, or exploring the civil law roots of Anglo-American commercial law, should note that merx provides a conceptual ancestor to modern statutory definitions of "goods" in instruments such as the Uniform Commercial Code.
The term also appears in discussions of commercial vocabulary in early treatises on merchants and trade. Because Burrill's and Black's both cite Wood's Lectures and common law commercial commentaries, researchers using those sources as entry points into early commercial law doctrine should treat merx as a gateway term to broader civil law sources, not a freestanding common law concept.
One trap in historical sources: the second edition of Black's contains a typographical corruption in the entry ("movable ar. ticles" and stray text from adjacent entries), which reflects the OCR and typesetting challenges in digitized historical law dictionaries. Researchers relying on digitized versions of Black's 2nd Ed. should cross-check against the print edition when precision matters.
Historical Dictionary Support
The four historical sources are in close agreement. Black's (both editions), Bouvier's, and Burrill's all define merx as merchandise or movable articles of trade. The definitions are brief and largely derivative of one another — none offers substantive doctrinal analysis.
Bouvier's entry is minimal: a single word, "Merchandise," without elaboration. This is consistent with Bouvier's treatment of Latin terms that function primarily as civil law vocabulary rather than as operative common law concepts.
Burrill's entry is the most precise in its language ("moveable articles that are bought and sold; articles of trade") and also the cleanest textually. The stray material appearing in the Burrill's entry about "mescroyantz" and Britton is an artifact of adjacent-entry contamination in the digitized source and is not part of the merx entry.
All sources that go beyond a bare definition include the maxim Merx est quicquid vendi potest, citing "Com. 355" and "3 Wood. Lect. 263." These citations point to early commercial law commentaries; researchers should note they are not case citations.
What historical dictionaries omit: no source traces merx to its role in Roman law's emptio venditio or connects it to the pretium/merx distinction that structured the civil law of sale. Researchers needing that analytical grounding should consult civil law treatises directly rather than relying on common law dictionaries.