The Law School Authority

Comparison of contract and tort law


Scope of common law contract law

Basic common law contract law addresses four sets of issues:

1. When and how is a contract formed?

Contract formation: There must be an agreement which consists of an offer and acceptance, consideration (see also consideration under English law) and contractual intention for a simple contract to exist: i.e. it is not a deed – otherwise no consideration is needed.

Subject to the sine quo non of Contract Formation, other ingredients that make up a contract include:

* Form – In some cases, certain formalities (that is, writing) must be observed.
* Capacity – The parties must be legally capable of entering into a contract.
* Consent – The agreement must have been entered into freely. Consent may be vitiated by duress or undue influence.
* Legality – The purpose of the agreement must not be illegal or contrary to public policy.

A contract which possesses all of the above ingredients is said to be valid. The absence of an essential element will render the contract either void, voidable or unenforceable

In some situations, a collateral contract may exist.



Validity of contracts

For a contract to be valid, it must meet the following criteria:

* Mutual agreement – (see main article offer and acceptance): There must be an express or implied agreement. The essential requirement is that there be evidence that the parties had each from an objective perspective engaged in conduct manifesting their assent, and a contract will be formed when the parties have met such a requirement. For a contract based on offer and acceptance to be enforced, the terms must be capable of determination in a way that it is clear that the parties assent was given to the same terms. The terms, like the manifestation of assent itself, are determined objectively.

* Consideration: There must be consideration (see also consideration under English law) given by all the parties, meaning that every party is conferring a benefit on the other party or himself sustaining a recognizable detriment, such as a reduction of the party’s alternative courses of action where the party would otherwise be free to act with respect to the subject matter without any limitation.

* Competent, Adult (Sui Juris) Parties: Both parties must have the capacity to understand the terms of the contract they are entering into, and the consequences of the promises they make. For example, animals, minor children, and mentally disabled individuals do not have the capacity to form a contract, and any contracts with them will be considered void or voidable. Although corporations are technically legal fictions, they are considered persons under the law, and thus fit to engage in contracts.


* Proper Subject Matter: The contract must have a lawful purpose. A contract to commit murder in exchange for money will not be enforced by the courts. It is void ab initio, meaning “from the beginning.”


* Mutual Obligation to Perform: Both Parties must have some obligation to fulfill to the other. This can be distinct from consideration, which may be an initial inducement into the contract.

Written contracts

Contrary to common wisdom, an informal exchange of promises can still be binding and legally as valid as a written contract. A spoken contract is often called an “oral contract”, not a “verbal contract.” Any contract that uses words, spoken or written, is a verbal contract. Thus, all oral contracts and written contracts are verbal contracts. This is in contrast to a “non-verbal, non-oral contract,” also known as “a contract implied by the acts of the parties.”

Courts in the United States have generally ruled that if the parties have a meeting of the minds, and act as though there was a formal, written and signed contract, then a contract exists. However, most jurisdictions require a signed writing for certain kinds of contracts (like real estate transactions).

In the United States, a law setting out such requirements is typically called the Statute of Frauds; the name originates from an English statute that was for “the prevention of frauds.” The point of the Statute of Frauds is to prevent false allegations of the existence of contracts that were never made, by requiring formal (i.e. written) evidence of the contract. Contracts that do not meet the requirements of Statute of Frauds legislation are unenforceable, but not void. However, a party unjustly enriched by an unenforceable contract may be subject to restitution for unjust enrichment.


In England and Wales, the Statute of Frauds is still in force, but only for guarantees, which must be evidenced in writing, although the agreement may be made orally. Certain other kinds of contract (such as for the sale of land) must be in writing or they are void.

Furthermore, the existence of a written contract does not necessarily ensure its enforceability or validity. A contract can be deemed unenforceable if it requires a party to undertake an illegal act, if it was signed under duress or while intoxicated, if the disparity in knowledge between the parties is extreme and the weaker party was given onerous terms, etc. For example, in Massachusetts a contract is not enforceable if it is executed on a Sunday.

If the terms of a contract subject to Statute of Frauds legislation are to be varied, the variations must be noted in writing as well. However, the contract may be discharged orally.

If a contract is in a written form, then generally, you are bound by its terms regardless of whether you have read it or not (L’Estrange v. F Graucob Ltd [1934] 2 KB 394). However, this is tempered by the exception that if the terms of the contract are misrepresented, then the plaintiff is unable to rely on the terms of the contract; in addition, the document must be contractual in nature (Curtis v. Chemical Cleaning and Dyeing Co [1951] 1 KB 805).

Furthermore, if a party wishes to use a document as the basis of a contract, reasonable notice of its terms must be given to the other party prior to their entry into the contract (see Balmain New Ferry Company Ltd v. Robertson (1906) 4 CLR 379). This includes such things as tickets issued at parking stations.

Void, voidable and unenforceable contracts

In general, there are three classifications of contracts that are not binding:

* Void: If a contract is held to be void, the contract has never come into existence. For example, a contract is void if it is based on an illegal purpose or contrary to public policy; the classic example is a contract with a hit man. Such a contract will not be recognized by a court, and cannot be enforced by either party.
* Voidable: A contract is voidable if one of the parties has the option to terminate the contract. Contracts with minors are examples of voidable contracts.
* Unenforceable: If a contract is unenforceable, neither party may enforce the other’s obligations. For example, in the United States, a contract is unenforceable if it violates the Statute of frauds. An example of the above is an oral contract for the sale of a motorcycle for US$5,000 (because in the USA any contract for the sale of goods over US$500 must be in writing to be enforceable).

Uncertainty and incompleteness

If the terms of the contract are uncertain or incomplete, the parties cannot have reached an agreement in the eyes of the law. An agreement to agree does not constitute a contract, and an inability to agree on key issues, which may include such things as price, may cause the entire contract to fail.

However, a court will attempt to give effect to commercial contracts where possible, by construing a reasonable construction of the contract (see Hillas v. Arcos Ltd (1932) 147 LT 503).

Courts may also look to external standards, which are either mentioned explicitly in the contract (Whitlock v. Brew (1968) 118 CLR 445) or implied by common practice in a certain field (Three Rivers Trading Co., Ltd. v. Gwinear & District Farmers, Ltd. (1967), 111 Sol. J. 831). In addition, the court may also imply a term; if price is excluded, the court may imply a reasonable price, with the exception of land, and second-hand goods, which are unique.

Severence of unenforceable clauses

If there are uncertain or incomplete clauses in the contract, and all options in resolving its true meaning have failed, it may be possible to sever and void just those affected clauses. The test of whether a clause is severable is an objective test – whether a reasonable person would see the contract standing even without the clauses.

Spy contracts


Bilateral v. unilateral contracts

Contracts may be bilateral or unilateral. The more common of the two, a bilateral contract, is an agreement in which each of the parties to the contract makes a promise or promises to the other party. For example, in a contract for the sale of a home, the buyer promises to pay the seller £200,000 in exchange for the seller’s promise to deliver title to the property.

In a unilateral contract, only one party to the contract makes a promise. A typical example is the reward contract: A promises to pay a reward to B if B finds A’s dog. B is not obliged to find A’s dog, but A is obliged to pay the reward to B if B finds the dog. In this example, the finding of the dog is a condition precedent to A’s obligation to pay.

An offer of a unilateral contract may often be made to many people (or ‘to the world’) by means of an advertisement. In that situation, acceptance will only occur on satisfaction of the condition (such as the finding of the offeror’s dog). If the condition is something that only one party can perform, both the offeror and offeree are protected — the offeror is protected because he will only ever be contractually obliged to one of the many offerees; and the offeree is protected, because if she does perform the condition, the offeror will be contractually obliged to pay her.

In unilateral contracts, the requirement that acceptance be communicated to the offeror is waived. The offeree accepts by performing the condition, and the offeree’s performance is also treated as the price, or consideration, for the offeror’s promise.

The most common type of unilateral contract is the insurance contract. The insurance company promises to pay the insured a stated amount of money on the happening of an event if the insured pays premiums; note that the insured does not make any promise to pay the premiums.

Courts generally favor bilateral contracts. The general rule in the United States is: “In case of doubt, an offer is interpreted as inviting the offeree to accept either by promising to perform what the offer requests or by rendering the performance, as the offeree chooses.” Restatement (Second) of Contracts § 32 (1981) (emphasis added). Here the law attempts to provide some protection from the risk of revocation in a unilateral contract to the offeree. Note that if the offer specifically requests performance rather than a promise, a unilateral contract will exist. See option contracts for more information on protection given to the offeree in a unilateral contract.

Express and implied contracts

A contract can be either an express contract or an implied contract. An express contract is one in which the terms are expressed verbally, either orally or in writing. An implied contract is one in which some of the terms are not expressed in words.

Implied in fact or implied in law




Incorporation of terms

Course of dealing


Express and implied terms

Different types of statements




* Knowledge and expertise: In Oscar Chess Ltd v. Williams [1957] 1 WLR 370, a person selling a car to a second-hand car dealer stated that it was a 1948 Morris, when in fact it was a 1939 model car. It was held that the statement did not become a term because a reasonable person in the position of the car dealer would not have thought that an inexperienced person would have guaranteed the truth of the statement.

Terms implied in fact



In Australia, the High Court has ruled that the test in BP Refinery applies only to formal contracts, while the test in Byrne and Frew v. Australian Airlines Ltd (1995) 185 CLR 410 shall apply to informal contracts:

* Obvious: McHugh and Gummow JJ have stated that it must also be obvious.

Terms implied in law

These are terms that have been implied into standardised relationships. The other difference between this and terms implied in fact is that the test is one of necessity (Liverpool City Council v. Irwin [1976] 2 WLR 562); a necessary term is one where the contract is rendered worthless or nugatory if it is without it.

Terms implied by custom or trade

You are generally bound by the custom of the industry that you are in. To imply a term due to custom or trade, you must prove the existence of the custom, which must be notorious, certain, legal and reasonable (Con-stan Industries of Australia Pty Ltd v. Norwich Winterthur Insurance (Australia) Ltd (1986) 160 CLR 226). See also Frigaliment Importing Co., Ltd., v. B.N.S. International Sales Corp., 190 F. Supp. 116 (S.D.N.Y. 1960) (plaintiff failed to prove what he meant by “chicken”) and U.C.C. § 1-205.

Agreements to negotiate


* There exists some mechanism to resolve disputes if the negotiations broke down.


“Subject to” contracts

If a contract specifies “subject to contract”, it may fall into one of three categories (Masters v. Cameron (1954) 91 CLR 353):

1. The parties are immediately bound to the bargain, but they intend to restate the deal in a formalised contract that will not have a different effect; or
2. The parties have completely agreed to the terms, but have made the execution of some terms in the contract conditional on the creation of a formalised contract; or
3. It is merely an agreement to agree, and the deal will not be concluded until the formalised contract has been drawn up.

If a contract specifies “subject to finance”, it imposes obligations on the purchaser (Meehan v. Jones (1982) 149 CLR 571):

* The purchaser must seek finance; and

Once again, there is an element of good faith involved.


Statutory law applicable to contracts

The rules by which many contracts are governed are provided in specialized statutes that deal with particular subjects. Most countries, for example, have statutes which deal directly with sale of goods, lease transactions and trade practices. For example, most American states have adopted Article 2 of the Uniform Commercial Code, which regulates contracts for the sale of goods.

There are also many acts around the world which deal with specific types of transactions and businesses. For example, the states of California and New York in the U.S. have statutes that govern the provision of services to customers by health studios, and the UK has the Sale of Goods Act 1979 which governs the contracts between sellers and buyers.



Typically, the remedy for breach of contract is an award of money damages. Courts usually adopt one of three ways of calculating the value of damages.

The most common is to assess the sum which would restore the injured party to the economic position that he or she expected from performance of the promise or promises (known as an “expectation measure” or “benefit-of-the-bargain” measure of damages).

When it is either not possible or desirable to award damages measured in that way, a court may award money damages designed to restore the injured party to the economic position that he or she had occupied at the time the contract was entered (known as the “reliance measure”), or designed to prevent the breaching party from being unjustly enriched (“restitution”).

Specific perfomance

There may be circumstances in which it would be unjust to permit the defaulting party simply to buy out the injured party with damages. For example where an art collector purchases a rare painting and the vendor refuses to deliver, the collector’s damages would be equal to the sum paid.

The court may make an order of what is called “specific performance”, requiring that the contract be performed. In some circumstances a court will order a party to perform his or her promise (an order of “specific performance”) or issue an order, known as an “injunction,” that a party refrain from doing something that would breach the contract.




Many contracts provide that all contract disputes must be arbitrated by the parties to the contract, rather than litigated in courts. By law, some contracts, including most securities brokerage contracts, must be arbitrated; other contracts are referred by courts as a matter of local law or policy. Arbitrated judgements are generally enforced and appealed in the same manner as ordinary court judgements; a majority of states have adopted the Uniform Arbitration Act to facilitate the enforcement of arbitrated judgements.


Theoretical considerations

