Carlill v Carbolic Smoke Ball Co (1893)

 case law wrriten by Barrister Amna 

Carlill v Carbolic Smoke Ball Co (1893)


πŸ“ Name of the Case

Carlill v Carbolic Smoke Ball Co (1893)
Court: Court of Appeal (England)
Citation: [1893] 1 QB 256

πŸ“š Introduction

This is one of the most famous cases in contract law. It explains how a unilateral contract is made and when an advertisement becomes a valid offer.

πŸ‘©‍⚖️ Parties Involved

  • Plaintiff (Claimant): Mrs. Carlill


  • Defendant: Carbolic Smoke Ball Company


πŸ“’ Facts of the Case

  • The Carbolic Smoke Ball Company sold a product called the Smoke Ball which claimed to prevent people from getting the flu.

  • The company advertised in newspapers:

    “We promise to pay £100 to anyone who catches the flu after using our smoke ball as directed, 3 times daily for 2 weeks.”

  • They also said they had deposited £1,000 in the bank to show they were serious.


  • Mrs. Carlill used the smoke ball as instructed but still got the flu.

  • She asked for the £100 reward, but the company refused to pay.

  • She took the company to court.

πŸ“œ Legal Issue

  • Was the company's advertisement a binding contract?

  • Did Mrs. Carlill accept the offer?

  • Was there a valid contract between the two parties?

🧠 Arguments by the Company

  • The advertisement was just a marketing trick, not a real offer.

  • Mrs. Carlill never informed them that she accepted the offer.

  • There was no contractual agreement because no communication happened.

⚖️ Court’s Decision

The Court of Appeal ruled in favor of Mrs. Carlill.

πŸ“Œ Key Legal Principles Explained

1. ✅ Unilateral Offer

  • The advertisement was a unilateral offer — a promise made to the world, which anyone could accept by doing the act (using the smoke ball).

  • No need to notify acceptance, just performing the act is enough.

2. πŸ’΅ Consideration

  • Mrs. Carlill used the smoke ball as directed — this was consideration (she did something in return for the reward).

3. πŸ“‘ Intention to Create Legal Relations

  • The company said they deposited £1,000 in the bank. This showed a serious intention to be legally bound.

4. 🀝 Acceptance by Conduct

  • In unilateral contracts, you accept the offer by doing the required action (using the product), not by saying anything.

πŸ”š Final Judgment

The court said:

  • Yes, the advertisement was a valid offer.

  • Yes, Mrs. Carlill accepted it by using the smoke ball as directed.

  • Yes, there was a contract, and she deserved the £100.

🧾 Legal Importance of the Case

  • This case is a leading authority on:

    • Unilateral contracts

    • Offer and acceptance

    • Legal intention in advertisements

  • Still studied in law schools around the world today.

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