Pao On v Lau Yiu Long

Pao On v Lau Yiu Long
This case revolves around the enforceability of a guarantee given by the Laus (defendants) to the Paos (plaintiffs) concerning the value of shares. Understanding the case requires grasping the context, the legal issues, and the court's decision.
I. Case Facts:

The Main Agreement (Feb 27, 1973): The Paos sold their shares in Shing On (private company) to Fu Chip (public company), receiving 4.2m Fu Chip shares (valued at $2.50 each) as payment. The Paos agreed not to sell 2.5m of these shares before May 1974.
The Subsidiary Agreement (Feb 27, 1973): To protect the Paos against share value decline, the Laus agreed to buy back the 2.5m shares at $2.50 per share before April 30, 1974.
The Revised Agreement (May 4, 1973): The Paos realized the subsidiary agreement limited their potential profit and threatened to void the main agreement unless a guarantee against loss was provided. Due to the potential damage to Fu Chip's reputation, the Laus agreed to a guarantee that they would compensate the Paos if the Fu Chip shares fell below $2.50 by April 30, 1974. The share price did fall significantly (to $0.36).
The Dispute: The Laus argued that their guarantee wasn't legally binding. The Paos sued.

II. Legal Issues:

Consideration: Did the Paos provide sufficient consideration for the Laus' guarantee? The Laus argued that the Paos' promise to complete the main agreement was past consideration, hence unenforceable. The court needed to examine whether past consideration could be valid in this circumstance.
Pre-existing Duty to a Third Party: Was the Paos' promise to complete the main agreement with Fu Chip (a pre-existing contractual duty) valid consideration for the Laus' guarantee?
Duress: Did the Laus enter the guarantee under duress, thereby making it voidable?

III. Court's Decision:

Consideration: The Privy Council held that the Paos did provide sufficient consideration. While their promise to complete the main agreement preceded the guarantee, it met the requirements of valid past consideration as established in Lampleigh v Braithwait and In Re Casey’s Patents:
1. The act (completing the main agreement) was done at the promisor's (Laus') request.
2. The parties understood the act would be remunerated (by the guarantee).
3. The remuneration (guarantee) would have been legally enforceable had it been promised beforehand.
Pre-existing Duty to a Third Party: The court confirmed that a promise to perform, or the performance of, a pre-existing contractual obligation to a third party (Fu Chip) can be valid consideration for a contract with a different party (the Laus).
Duress: The court found no evidence of duress, but obiter dicta (a statement made by the way) clarified that economic duress could make a contract voidable if it amounted to coercion of will, vitiating consent. Essentially, the payment or contract must not have been a voluntary act.

IV. Key Principles and Cases:

Past Consideration: An act done before a promise can be good consideration if performed at the promisor's request, with the understanding it would be remunerated, and legally enforceable if promised beforehand. (Lampleigh v Braithwait, In Re Casey’s Patents)
Pre-existing Duty to a Third Party: A pre-existing contractual duty owed to a third party can constitute valid consideration for a contract with another party.
Economic Duress: A contract can be voidable due to economic duress if the will of one party was coerced, resulting in a non-voluntary act.

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