This advice will consider whether a binding contract has been formed between Chanda and the person offering the reward. For Chanda to have a contractual right to the reward, he must demonstrate that all the elements of a valid contract are present, specifically in the context of a unilateral contract. The key issue will be whether Chanda’s performance of the required act constitutes a valid acceptance of the offer.
Unilateral Contracts
In a typical bilateral contract, promises are exchanged between two parties. However, a reward offer is usually classified as a unilateral contract. A unilateral contract is created when one party, the offeror, makes a promise in exchange for the performance of an act by the other party, the offeree. The contract is formed not when the offeree promises to act, but when they actually perform the specified act.
The leading case of Carlill v Carbolic Smoke Ball Co [1893] 1 QB 256 established the principles of a unilateral offer. An advertisement can constitute an offer to the world at large, which can be accepted by anyone who performs the conditions set out in it. In a reward scenario, the advertisement of the reward is the offer, and the act of, for example, returning a lost item or providing information, is the acceptance. For a contract to be formed, Chanda must have accepted the offer by completing the required act.
Acceptance and Knowledge of the Offer
A fundamental principle of contract law is that acceptance must be made in response to a known offer. An individual cannot accept an offer of which they are unaware. This creates a crucial question for Chanda: did he know about the reward at the time he performed the act?
The case law on this point provides a clear, if strict, rule. In R v Clarke (1927) 40 CLR 227, an Australian case that is highly persuasive in England and Wales, a reward was offered for information leading to the arrest of certain murderers. Clarke gave the information, but he did so to clear himself of suspicion and admitted he had forgotten about the reward at the time. The High Court of Australia held that he was not entitled to the reward. The court reasoned that acceptance requires the act of performance to be done on the faith of, or in reliance upon, the offer. As Clarke was not acting in response to the offer, no contract was formed.
This can be contrasted with Williams v Carwardine (1833) 5 C & P 566, where the claimant knew of a reward for information but provided it because she believed she was dying and wished to ease her conscience. The court held that her motive was irrelevant; as long as she was aware of the offer when she gave the information, she was entitled to the reward.
Therefore, Chanda’s legal position depends almost entirely on his state of knowledge.
Application to Chanda’s Situation
To advise Chanda properly, we must consider different factual scenarios:
- Chanda knew of the reward before he performed the act. If Chanda saw the reward poster or advertisement and then, with that knowledge, returned the lost item or provided the information, he has a strong claim. Based on Williams v Carwardine, his motive for doing so does not matter. The performance of the act while knowing of the offer is sufficient to constitute acceptance, and a binding contract is formed. He would have a contractual right to claim the reward.
- Chanda was unaware of the reward until after he performed the act. If Chanda found and returned the item out of goodwill and only later discovered a reward had been offered, he has no contractual right to it. The principle from R v Clarke would apply. His act was not an acceptance of the offer because he was ignorant of it. He cannot retrospectively accept an offer after he has already performed the act.
- Chanda discovered the reward part-way through performance. A more complex situation could arise if Chanda started the act (e.g., began searching for a lost dog) without knowledge of the reward, but then became aware of it before completing the act (i.e., before returning the dog). The old case of Gibbons v Proctor (1891) 64 LT 594 suggests a person might be able to claim a reward in such circumstances. However, this case is viewed as inconsistent with the more modern and authoritative principle in R v Clarke, which requires the performance to be a response to the offer. Therefore, it is more likely that a court today would follow Clarke and deny Chanda’s claim unless he essentially began the act of acceptance afresh after learning of the offer.
Conclusion
In conclusion, Chanda’s contractual right to the reward is entirely dependent on whether he knew of the offer at the time he performed the required act.
- If he did know about the reward, a unilateral contract was formed upon his performance, and he can legally enforce the payment.
- If he did not know about the reward until after he had completed the act, there was no acceptance, and therefore no contract exists. He has no legal right to the reward.
Chanda should be advised that to succeed in a claim, he would need to prove that he was aware of the offer before or at the time of his performance.
References
Carlill v Carbolic Smoke Ball Co [1893] 1 QB 256
Gibbons v Proctor (1891) 64 LT 594
R v Clarke (1927) 40 CLR 227
Williams v Carwardine (1833) 5 C & P 566


