03. validity and vitiating factors

The question

The sub-units so far have assumed a contract validly formed and have examined its formation and its content. A contract that appears on its face to satisfy the requirements of formation may nonetheless be defective, because some factor present at its making impairs the agreement or the consent on which it rests. This sub-unit examines those factors, known as vitiating factors, the circumstances that impair a contract and entitle a party to escape it or render it ineffective. The question is what these factors are, how they operate, and what consequence each carries for the contract. The answer reveals a set of defects, broadly recognised across the traditions, that the law treats as undermining the bargain because the agreement was procured by misinformation, by improper pressure, or in circumstances the law will not countenance.

Void and voidable contracts

Before the vitiating factors are examined, a distinction must be fixed that governs their consequences, the distinction between a contract that is void and one that is voidable. A void contract is one that the law treats as never having had legal effect at all, a nullity from the outset, so that no rights or obligations arise from it and neither party can enforce it. A voidable contract, by contrast, is one that is valid and binding unless and until the party entitled to do so elects to set it aside, an act termed rescission; until rescinded, the contract is effective, and the right to rescind may be lost in certain circumstances.

This distinction connects to the analysis of legal validity in Course 1, for it concerns the degree to which a defect deprives an agreement of legal effect. The distinction matters greatly in practice, particularly for third parties: because a void contract never had effect, property purportedly transferred under it does not pass, and a third party who acquires that property acquires nothing; because a voidable contract is effective until rescinded, property may pass under it, and a third party who acquires the property in good faith before rescission may obtain a good title. The vitiating factors differ in which consequence they produce, some rendering a contract void and others rendering it voidable, and the difference determines both the steps a party must take and the rights of third persons.

Consider goods sold under a contract procured by one of the vitiating factors and then resold by the buyer to an innocent third party. If the vitiating factor renders the contract void, ownership never passed to the buyer, and the third party acquires no title, so the original seller may recover the goods. If the factor renders the contract merely voidable, ownership passed to the buyer, and an innocent third party who bought before the seller rescinded may keep the goods. The example shows the practical weight of the distinction between void and voidable.

The distinction between void and voidable is therefore the framework within which the vitiating factors operate, determining whether a defect annuls the contract from the outset or merely entitles a party to set it aside, with consequences that reach beyond the parties to those who deal with them.

Misrepresentation and mistake

The first group of vitiating factors concerns defects in the information on which agreement was reached. A misrepresentation is a false statement of fact made by one party that induces the other to enter the contract; where a party has been led into a contract by the other's false statement, the law allows that party to escape the contract, ordinarily rendering it voidable and so entitling the misled party to rescind, and in many cases to recover damages where the misrepresentation was made fraudulently or negligently. The law thus protects the integrity of consent by allowing a party to undo a contract procured by the other's falsehood.

A mistake is an erroneous belief held by a party at the time of contracting, and its effect is more limited and more various. The law does not relieve a party from a contract merely because that party made a poor bargain or misjudged the facts; relief for mistake is confined to certain serious cases, broadly recognised across the traditions, such as where both parties share a fundamental mistaken assumption about a matter essential to the contract, or where one party is mistaken as to the very identity of the thing contracted for or the person contracted with, in circumstances the other knew or ought to have known. Where such a serious mistake is established, it may render the contract void, since there was no true agreement on the essential matter. The connecting idea is that both misrepresentation and mistake concern a defect in the basis of the agreement, the one induced by the other party and the other arising from the parties' own erroneous belief.

Suppose a seller induces a buyer to purchase a machine by falsely stating its output capacity. The buyer, misled by the false statement of fact, may rescind the contract for misrepresentation and may recover damages if the statement was made fraudulently or negligently. Suppose instead that both parties contracted for the sale of a specific cargo that, unknown to either, had already been destroyed before the contract was made; the shared fundamental mistake as to the existence of the subject matter may render the contract void. The example shows misrepresentation operating to make a contract voidable at the instance of the misled party, and a fundamental shared mistake operating to render a contract void.

Misrepresentation and mistake are therefore the vitiating factors that concern the basis of agreement, misrepresentation allowing a party misled by the other's false statement to escape the contract, and mistake relieving a party only in the confined cases of serious error that the law recognises as undermining the agreement itself.

Duress and undue influence

The second group of vitiating factors concerns defects in the freedom of consent. Duress is illegitimate pressure applied to a party to compel that party to enter a contract, such as a threat of violence or, in its commercial form, an illegitimate threat to a party's economic interests that leaves no reasonable alternative but to submit. Where a contract is procured by duress, the law allows the coerced party to escape it, ordinarily rendering it voidable, because consent extracted by illegitimate pressure is not the free consent the law requires.

Undue influence is the improper exploitation of a relationship of trust or dependence to procure a contract, a more subtle defect than duress, arising where one party has acquired such influence over the other that the other's consent cannot be regarded as freely given. The law guards against undue influence particularly in relationships where one party reposes confidence in the other, and a contract procured by such influence is voidable at the instance of the party influenced. The connecting idea between duress and undue influence is that each concerns the freedom of consent rather than its information: the consent was given, but it was procured by pressure or by the abuse of a relationship, and the law will not hold a party to a bargain so obtained. This connects to the requirement, examined in the formation sub-unit, that consent be genuine, the vitiating factors of this group identifying the circumstances in which apparent consent is not genuine consent.

Imagine a supplier who, knowing a manufacturer depends entirely on the supplier's components and cannot obtain them elsewhere in time, threatens to withhold delivery unless the manufacturer agrees to a steep and unjustified price increase, leaving the manufacturer no reasonable alternative. A contract procured by such illegitimate economic pressure may be voidable for economic duress. Were a contract instead procured by one party's exploitation of the other's trust and dependence, it might be voidable for undue influence. The example shows duress and undue influence operating to relieve a party whose consent, though given, was not freely given.

Duress and undue influence are therefore the vitiating factors that concern the freedom of consent, duress through illegitimate pressure and undue influence through the abuse of a relationship of trust, each entitling the affected party to escape a contract to which consent was given but not freely given.

Illegality and incapacity

The final group of vitiating factors concerns defects not in the agreement or the consent but in the contract's content or the parties' competence. Illegality affects a contract whose making or performance involves a breach of law or is contrary to public policy; the law will not lend its aid to enforce a contract to do an unlawful act or one that offends a fundamental policy of the legal order, and such a contract is ordinarily void and unenforceable. The principle connects to the rule of law examined in Course 1, for a legal order cannot consistently enforce agreements to violate the very law it administers.

Incapacity concerns the competence of a party to bind itself by contract. The law recognises that certain persons lack, in whole or in part, the legal capacity to contract, and a contract made by a person who lacks capacity may be void or voidable according to the rules of the governing system. The most important application in the commercial setting concerns the capacity of juridical persons, examined in the module on business organisations, since a company's capacity to contract may be limited by the instrument that constitutes it, and a person dealing with a company must attend to whether the company and those acting for it have authority to bind it, a matter the modules on agency and on companies develop. The connecting idea is that illegality and incapacity each deny enforceability for reasons external to the quality of the agreement itself, the one because the law will not countenance the contract's content and the other because a party lacked the competence to make it.

Consider a contract whose object is the performance of an act the law prohibits. The contract is illegal, and the law will not enforce it, leaving the parties without a remedy upon it, for the legal order will not assist in the accomplishment of what it forbids. Consider separately a contract purportedly made on behalf of a company by a person who had no authority to bind it and that exceeded the company's capacity; the question whether the company is bound is governed by the rules of capacity and authority examined later in this course. The example shows illegality denying enforcement on grounds of content and incapacity raising the distinct question of competence to contract.

Illegality and incapacity are therefore the vitiating factors that deny a contract effect for reasons beyond the agreement itself, illegality because the law will not enforce a contract whose making or performance it condemns, and incapacity because a party lacked the legal competence to bind itself, a matter of particular importance for contracts made by and on behalf of companies.