What is the ratio in Hartley v Ponsonby?

Where performance of contractual duties becomes substantially more onerous than originally contemplated, this can constitute valid fresh consideration for additional promises.

What did the court decide in Hartley v Ponsonby?

The court held that the crew could recover the extra pay as their agreement to sail dangerously undermanned constituted valid consideration.

Why is Hartley v Ponsonby important for contract law?

It establishes a crucial exception to the existing duty rule, showing that substantially different performance can constitute valid consideration for additional promises.

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