Terms can be implied to reflect the presumed intention of the parties, or for reasons of public policy. The different bases for implying terms are considered below.
Terms Implied to Give Effect to Presumed Intention of Parties
Term implied on the basis of business efficacy
Business efficacy means that the parties require that term in order that the contract will work (The Moorcock).
The following rules for implying a term on the basis of business efficacy were summarised by the Privy Council in BP Refiner v Shire of Hastings and later approved by the High Court in Codelfa v State. • The term must be reasonable and equitable; • Implication must be necessary to give business efficacy to the contract so that no term will be implied if the contract is effective without it; • Term must be so obvious that it goes without saying; • Term must be capable of clear expression; and • Term must not contradict any express term of the contract.
Terms implied from previous consistent course of dealings
In the circumstances of the case, is it reasonable to hold that the parties entered into the contract on the basis, and with the knowledge, that their agreement would be on the terms set out in previous contracts entered into (Henry Kendall & Sons v William Lillico & Sons).
The relevant term or terms must have been part of earlier agreements between the parties and the must be evidence of an earlier consistent course of dealings between the parties. Relevant in this assessment are – • the number of dealings between the parties; and • the consistency of dealings between the parties.
The greater the number of prior dealings, the greater the likelihood of incorporating the term (cf Hollier v Rambler Motors with McCuthbert v David MacBrayne). Consistency of contractual dealings is also important as the argument for incorporation is less compelling if the terms are incorporated into earlier contracts on some