Nature Of A Contract: Agreement; Unilateral; Bilateral; Collateral

Nature Of A Contract

• Contract
  • A legally binding agreement recognised and enforceable by the courts of England and Wales
  • Creates legally enforceable rights and obligations between parties
  • Allows courts to award remedies where obligations are not fulfilled
• Purpose of contract law
  • Facilitate commercial transactions
  • Promote certainty and predictability
  • Protect reasonable expectations
  • Enforce voluntarily undertaken obligations
• Main requirements for a valid contract
  • Agreement
  • Intention to create legal relations
  • Consideration
  • Capacity
  • Certainty of terms
  • Legality
• Agreement
  • The foundation of every contract
  • Without agreement, a contract cannot exist

Agreement

Meaning Of Agreement

• Agreement
  • Exists when one party makes an offer and another party accepts it
  • Represents mutual assent between parties
  • Forms the basis of contractual obligations
• Formula
  • Offer + Acceptance = Agreement
• Agreement does not automatically create a legally enforceable contract
  • Other elements must also be present

Objective Approach To Agreement

• English contract law uses an objective test
  • Courts focus on outward conduct
  • Courts examine words and actions
  • Courts consider how a reasonable person would interpret behaviour
• Courts generally do not consider
  • Hidden intentions
  • Undisclosed beliefs
  • Private misunderstandings
• Importance
  • Promotes certainty
  • Prevents parties escaping liability through later claims about intentions
  • Supports commercial confidence

Case: Smith v Hughes

Facts

• Seller offered oats for sale
• Buyer believed oats were old oats
• Oats were actually new oats
• Buyer attempted to avoid contract

Decision

• Contract remained valid

Legal Principle

• Objective test applies
• Party is bound by what a reasonable person would understand from conduct and statements

Significance

• One of the most important authorities on objective agreement
• Establishes that apparent agreement is more important than undisclosed intention

Consensus Ad Idem

Meaning

• Latin phrase meaning “meeting of minds”

Traditional View

• Parties must agree to exactly the same thing

Modern Position In England And Wales

• Courts focus on objective agreement rather than actual mental agreement
• Outward appearance is usually more important than subjective intention

Case: Centrovincial Estates Ltd v Merchant Investors Assurance Co Ltd

Facts

• Rent review document contained an error
• One party recognised the mistake
• Attempt made to rely on the mistake

Decision

• Contract remained enforceable

Principle

• Objective interpretation prevails
• What parties outwardly agreed is decisive

Importance Of Agreement In Contract Law

• Creates legal certainty
• Facilitates business transactions
• Protects commercial expectations
• Allows enforcement of promises
• Forms the first step in contract formation

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total Personal A Grades, 7 Distinctions and 11 World Records For Educate A Change A Level Law Full Scale Course

Bilateral Contracts

Definition

• Bilateral contract
  • A contract formed through an exchange of promises
  • Each party promises something to the other
• Structure
  • Promise ↔ Promise
• Most common type of contract in England and Wales

Essential Characteristics

Exchange Of Promises

• Both parties undertake obligations
• Both parties acquire rights

Immediate Formation

• Contract formed as soon as promises are exchanged
• Actual performance may occur later

Mutual Consideration

• Each promise serves as consideration for the other promise

Reciprocal Obligations

• Duties exist on both sides

Common Examples

Sale Of Goods Contract

• Seller promises delivery of goods
• Buyer promises payment

Employment Contract

• Employee promises to perform work
• Employer promises wages

Building Contract

• Builder promises construction
• Customer promises payment

Service Contract

• Service provider promises service
• Customer promises payment

Case: Brogden v Metropolitan Railway Co

Facts

• Coal supplier had traded with railway company for many years
• Written contract drafted
• Amendments made
• Parties acted according to arrangement

Decision

• Contract existed

Legal Principle

• Bilateral contracts may arise through conduct
• Mutual obligations can be inferred from behaviour

Significance

• Demonstrates practical formation of contractual agreements
• Shows importance of conduct in contract law

Legal Effects Of Bilateral Contracts

Rights

• Right to performance
• Right to damages for breach
• Right to terminate where appropriate
• Right to equitable remedies in suitable cases

Obligations

• Perform contractual promises
• Comply with agreed terms
• Avoid breach of contract

Advantages Of Bilateral Contracts

• Commercial certainty
• Predictability
• Mutual protection
• Easy identification of obligations
• Suitable for complex transactions

Disadvantages Of Bilateral Contracts

• Can involve lengthy negotiations
• May lead to disputes over interpretation
• Often require detailed documentation
• Risk of ambiguity if poorly drafted

Evaluation

Strengths

• Encourages economic activity
• Facilitates business planning
• Creates stable legal relationships

Weaknesses

• Can favour stronger bargaining parties
• Complex contracts may be difficult to understand
• Negotiation costs may be significant

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total Personal A Grades, 7 Distinctions and 11 World Records For Educate A Change A Level Law Full Scale Course

Unilateral Contracts

Definition

• Unilateral contract
  • Contract in which one party promises something in return for an act
  • Acceptance occurs through performance of the required act
• Structure
  • Promise → Act
• No counter-promise required

Essential Characteristics

One-Sided Promise

• Offeror makes promise
• Offeree not required to perform

Acceptance Through Conduct

• Performance constitutes acceptance

Communication Generally Unnecessary

• Performing the act is sufficient acceptance

Frequently Used For

• Rewards
• Promotional offers
• Public advertisements
• Bonus arrangements

Example

• Reward offer
  • “£1000 reward for return of lost jewellery”
• Acceptance
  • Returning jewellery
• Contract arises upon completion of requested act

Leading Case: Carlill v Carbolic Smoke Ball Co

Facts

• Company advertised smoke ball product
• Promised £100 reward if influenza contracted after proper use
• Company deposited £1000 in bank
• Mrs Carlill used product correctly
• Contracted influenza
• Claimed reward

Decision

• Contract existed
• Company liable to pay reward

Legal Principles

• Advertisements can amount to offers
• Acceptance can occur through performance
• Communication of acceptance may not be required
• Deposit demonstrated intention to create legal relations

Significance

• Most important unilateral contract authority
• Frequently examined in contract law

Revocation Of Unilateral Contracts

General Rule

• Offer may normally be revoked before acceptance

Problem

• Acceptance occurs through performance
• Uncertainty arises when performance has started but not finished

Case: Errington v Errington and Woods

Facts

• Father promised house ownership
• Couple required to pay mortgage instalments
• Father died before completion

Decision

• Offer could not be revoked after performance commenced

Principle

• Beginning performance may create protection for offeree

Case: Daulia Ltd v Four Millbank Nominees Ltd

Principle

• Offeror may be prevented from revoking once performance has begun

Significance

• Protects fairness in unilateral contracts

Advantages Of Unilateral Contracts

• Encourages performance
• Useful for rewards
• Flexible acceptance mechanism
• Effective commercial tool

Disadvantages Of Unilateral Contracts

• Revocation issues
• Uncertainty regarding commencement of performance
• Possible disputes regarding completion

Evaluation

Strengths

• Flexible
• Practical
• Promotes socially useful actions

Weaknesses

• Judicial rules not always clear
• Revocation principles remain complex

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total Personal A Grades, 7 Distinctions and 11 World Records For Educate A Change A Level Law Full Scale Course

Collateral Contracts

Definition

• Collateral contract
  • Secondary contract existing alongside a principal contract
  • One promise induces entry into another contract
• Two contracts exist
  • Main contract
  • Collateral contract

Purpose

• Protect reliance on important assurances
• Prevent unfair outcomes
• Provide contractual remedies where appropriate

Requirements

Clear Promise

• Definite assurance must be given

Reliance

• Promise must influence claimant’s decision

Intention To Create Legal Relations

• Promise intended to have legal effect

Consideration

• Usually supplied by entry into main contract

Leading Case: Shanklin Pier Ltd v Detel Products Ltd

Facts

• Pier owners requested recommendation regarding paint
• Manufacturer recommended specific paint
• Paint purchased through contractors
• Paint proved defective

Decision

• Collateral contract existed

Legal Principle

• Important assurances may create independent contractual obligations

Significance

• Leading authority on collateral contracts

Case: De Lassalle v Guildford

Facts

• Landlord stated drains were in good condition
• Tenant entered lease relying on statement
• Drains defective

Decision

• Collateral contract established

Principle

• Pre-contract assurances can become legally enforceable promises

Case: Evans & Son Ltd v Andrea Merzario Ltd

Facts

• Carrier promised goods would be stored below deck
• Goods stored on deck
• Goods lost

Decision

• Promise enforceable

Principle

• Important assurances may override standard written terms

Advantages Of Collateral Contracts

• Promotes fairness
• Protects reliance
• Reflects commercial reality
• Prevents injustice

Disadvantages Of Collateral Contracts

• Difficult to prove
• Creates evidential challenges
• May undermine certainty of written agreements
• Can overlap with misrepresentation law

Evaluation

Strengths

• Prevents unfair conduct
• Protects reasonable expectations
• Allows courts to achieve justice

Weaknesses

• Boundaries uncertain
• Judicially developed doctrine
• Potential inconsistency

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total Personal A Grades, 7 Distinctions and 11 World Records For Educate A Change A Level Law Full Scale Course

Comparison Between Bilateral, Unilateral And Collateral Contracts

Key Cases For Examination

• Smith v Hughes (1871)
  • Objective agreement
• Centrovincial Estates Ltd v Merchant Investors Assurance Co Ltd (1983)
  • Objective interpretation
• Brogden v Metropolitan Railway Co (1877)
  • Bilateral contracts
• Carlill v Carbolic Smoke Ball Co (1893)
  • Unilateral contracts
• Errington v Errington and Woods (1952)
  • Revocation after performance begins
• Daulia Ltd v Four Millbank Nominees Ltd (1978)
  • Protection of performance
• Shanklin Pier Ltd v Detel Products Ltd (1951)
  • Collateral contracts
• De Lassalle v Guildford (1901)
  • Pre-contract assurances
• Evans & Son Ltd v Andrea Merzario Ltd (1976)
  • Reliance on assurances

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total Personal A Grades, 7 Distinctions and 11 World Records For Educate A Change A Level Law Full Scale Course