PRINCIPLE STATEMENT

Rights which have been conferred on sellers or buyers under the Sale of Goods Act, 1893 are rights that arise under the contract by the implication of law; Section 55 of that Act provides that where any right, duty or liability would arise under a contract of sale of goods by implication of law, it may be negatived or varied by express agreement; accordingly, if the contract expressly creates a lien, right of retention, repossession or other form of security for the price, such express terms will prevail over, and therefore exclude the statutory implication of a lien, at least to the extent of any inconsistency with the express terms.

RATIO DECIDENDI (SOURCE)

Per Iguh, JSC, in Afrotec Technical Services (Nig) Ltd v. Mia & Sons Ltd & Anor (2000) NLC-1321992(SC) at pp. 46–47; Paras. B–A.
"Rights which have been conferred on sellers or buyers under the Sale of Goods Act, 1893 are rights that arise under the contract between the parties by the implication of law. Section 55 of that Act provides that where any right, duty or liability would arise under a contract of sale of goods by implication of law, it may be negatived or varied by express agreement between the parties. Accordingly, if the contract between the parties expressly creates a lien, a right of retention of the goods, repossession thereof or other form of security for the price, such express terms will prevail over, and therefore exclude the statutory implication of a lien, at least to the extent of any inconsistency with the express terms."
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EXPLANATION / SCOPE

The Sale of Goods Act provides default rights by implication of law, but Section 55 permits parties to: negate these implied rights, vary them through express agreement, or substitute their own terms. When contracts expressly provide security arrangements (liens, retention rights, repossession rights, or other security for price), these express terms: prevail over statutory implications, exclude inconsistent statutory rights, and govern the relationship. This serves: party autonomy (freedom to contract), certainty (express terms control), and flexibility (parties can create security arrangements suited to their transaction). “Prevail over” means: express terms supersede implied rights, inconsistent statutory implications don’t apply, and parties’ agreement controls. However, express terms only exclude implications: to the extent of inconsistency—non-inconsistent statutory rights may coexist; if clearly intended—ambiguous terms may not negate statutory rights. This principle applies throughout Sale of Goods Act—most implied terms can be varied or excluded by agreement. Parties should: clearly express intended security arrangements, specify how they differ from statutory rights, and document variations from default statutory provisions. Courts will enforce parties’ express choices over statutory defaults

CASES APPLYING THIS PRINCIPLE