What is the ratio in Barton v Armstrong?

In duress cases, the illegitimate pressure need not be the sole or dominant cause of entering the contract, but must be 'a' contributing factor. The burden is on the defendant to prove threats contributed nothing.

What did the court decide in Barton v Armstrong?

The Privy Council held that a deed signed under death threats could be set aside for duress, even though the victim also had commercial reasons for signing.

Why is Barton v Armstrong important for duress law?

It establishes a liberal causation test for duress claims, making it easier for victims to succeed by requiring only that pressure was 'a' factor rather than the predominant cause.

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