Stilk v Myrick

Lord Ellenborough CJ, delivering the judgment of the court, held that the sailors' claim must fail. The central reasoning was grounded in the classical doctrine of consideration: every enforceable promise must be supported by consideration, meaning something of legal value moving from the promisee in exchange for the promisor's commitment. Where the promisee does no more than perform, or promise to perform, an obligation that already rests upon them by virtue of a subsisting contract, they furnish nothing new to the promisor and therefore provide no consideration in law.

The sailors were bound by the terms of their original contract of engagement to navigate and work the ship for the full duration of the voyage, doing whatever was reasonably necessary for that purpose. That contract remained on foot throughout; it had not been discharged, frustrated, or varied by mutual agreement on terms that provided fresh consideration on both sides. The desertion of two crew members altered the practical difficulty of the task but did not, in the court's view, alter the legal nature of the obligation already undertaken by the remaining sailors.

The court drew support from the earlier authority of Harris v Watson (1791) Peake 102, in which Lord Kenyon had refused to enforce a promise of extra wages made to sailors during a voyage on the ground that such promises, extracted in circumstances of maritime necessity, were contrary to public policy and productive of fraud and extortion. Lord Ellenborough, while endorsing the outcome in Harris v Watson, preferred to rest the decision in the present case upon the sounder doctrinal foundation of the absence of consideration rather than upon public policy alone, the latter being a less principled and more variable basis for decision.

The public policy dimension is nonetheless conceptually present in the reasoning of Stilk v Myrick, even in its consideration-based form. Lord Ellenborough was alert to the practical danger that, if sailors could routinely enforce promises of additional wages made under the duress of maritime conditions, captains and shipowners would be systematically vulnerable to opportunistic demands made at the moments of greatest vulnerability. The pre-existing duty rule operates, in this context, as an instrument of both doctrinal coherence and commercial protection.

The court distinguished, at least implicitly, the class of case in which the circumstances confronting the crew had changed so dramatically as to take their continued service outside the scope of the original contractual obligation. This distinction was later made explicit and applied in Hartley v Ponsonby (1857) 7 E & B 872, where so many sailors had deserted that completing the voyage had become a genuinely extraordinary undertaking. In that case, the remaining crew were held to have provided good consideration because what they agreed to do exceeded what their original contracts required. In Stilk v Myrick, by contrast, two desertions did not produce that threshold alteration.

The pre-existing duty rule as articulated in Stilk v Myrick applies not only to contractual duties owed to the promisor but, in its extended form, to duties imposed by law. However, the core holding concerns the contractual variant: where A is already under a contractual duty to B to perform a certain act, A's promise to B to perform that same act cannot be good consideration for a fresh promise by B to pay A more. The logic is that B receives nothing beyond that to which B was already entitled, and A suffers no detriment beyond that which A was already bound to undertake.

The principle was later affirmed and extended in the context of part payment of debts in Foakes v Beer (1884) 9 App Cas 605, in which the House of Lords applied the rule from Stilk v Myrick to hold that a creditor's promise to accept part payment in full satisfaction of a debt was unenforceable for want of consideration on the part of the debtor, who did no more than partly perform a pre-existing obligation. Foakes v Beer thus confirmed that the pre-existing duty rule operates with equal force in the context of agreements to accept less, reinforcing the breadth of the principle established in Stilk v Myrick.

The relationship between Stilk v Myrick and the doctrine of economic duress is significant. In Atlas Express Ltd v Kafco [1989] QB 833, the court applied reasoning consonant with Stilk v Myrick in holding that a contractual variation extracted under economic duress was unenforceable. The emergence of the independent doctrine of economic duress in English law has provided an additional and more targeted means of controlling coercive renegotiations, operating alongside rather than displacing the consideration-based analysis of Stilk v Myrick. Similarly, in Pao On v Lau Yiu Long [1980] AC 614, the Privy Council considered the interaction of consideration doctrine with economic duress, affirming that commercial pressure not amounting to duress does not vitiate a contract, but leaving intact the principle that a promise unsupported by consideration is unenforceable.

The most significant challenge to the principle in Stilk v Myrick came in Williams v Roffey Bros & Nicholls (Contractors) Ltd [1991] 1 QB 1, in which the Court of Appeal held that where one party promises additional payment to induce the other to complete performance of an existing contractual obligation, and the promisor obtains a practical benefit from that promise — such as the avoidance of a penalty clause or the continuation of a commercial relationship — that practical benefit may constitute good consideration for the additional promise. The court in Williams v Roffey Bros expressly distinguished rather than overruled Stilk v Myrick, confining the latter to cases where the promise of extra payment was extracted by duress or fraud, and holding that in the absence of those vitiating factors the practical benefit doctrine applied.

The precise relationship between Stilk v Myrick and Williams v Roffey Bros remains contested in academic commentary. Some scholars argue that the practical benefit analysis adopted in Williams v Roffey Bros effectively undermines the pre-existing duty rule by treating any identifiable factual benefit to the promisor as sufficient consideration, thereby collapsing the distinction between a binding and a non-binding renegotiation. Others maintain that the two cases are genuinely distinguishable, the former concerned with the extraction of promises under conditions of vulnerability, and the latter with freely negotiated adjustments in a commercial setting. The courts have not definitively resolved this tension, and the doctrinal relationship between the two authorities continues to generate academic debate.

It is also relevant that the court in Stilk v Myrick did not engage with any argument that the sailors might have been released from their original contracts by the desertion of their colleagues, so as to be free to contract afresh on new terms. Had the original contract been terminated by frustration or by mutual agreement, the sailors would have been at liberty to negotiate a new engagement on whatever terms they chose, and the consideration doctrine would have presented no obstacle. The case thus assumes, without extensive analysis, that the original contract remained fully operative notwithstanding the changed circumstances, a conclusion that reflects the narrow scope of the frustration doctrine as it then stood.

The court's reasoning also reflects a conception of consideration that is bilateral and exchange-based: the enforceability of a promise depends upon whether the promisee has given something of legal value in return. The sailors' continued service, however practically valuable to the captain, was legally worthless as consideration because it was already owed. This strict exchange-based analysis has been criticised by those who favour a more functional or reliance-based account of consideration, but it remains the orthodox position in English law and it is the position that Stilk v Myrick authoritatively established.

The Court of King's Bench held that the sailors were not entitled to the additional wages promised by the captain. The promise of extra wages was unenforceable because the sailors had provided no consideration for it: their performance of the voyage was nothing more than the performance of their pre-existing contractual obligation, and that existing obligation could not be converted into fresh consideration merely because the circumstances in which it was performed had become more demanding.

The pre-existing duty rule was thereby confirmed as a general principle of English contract law: where a party is already under a contractual obligation to perform a certain act, that party's promise to perform, or actual performance of, that same act cannot constitute consideration for a new and distinct promise made by the other contracting party. The action by Stilk was accordingly dismissed.

The decision was grounded primarily in consideration doctrine rather than public policy, although the policy concern of protecting shipowners and captains from opportunistic renegotiations in conditions of maritime necessity was acknowledged as a contextual justification for a strict application of the rule in the maritime employment context.

Stilk v Myrick is one of the most frequently cited authorities in English contract law and is treated in every major textbook as the leading case on the pre-existing contractual duty rule. Its significance lies not merely in the resolution of a particular dispute between a sailor and a shipowner, but in the clear articulation of a principle — that