What is the ratio in Esso Petroleum v Harper's Garage?

Exclusive dealing agreements can constitute restraints of trade and must satisfy the Nordenfelt reasonableness test, with excessive duration making them void.

What did the court decide in Esso Petroleum v Harper's Garage?

The House of Lords held that the 4-year tie was reasonable but the 21-year exclusive dealing agreement was void as unreasonable.

Why is Esso Petroleum v Harper's Garage important for restraint of trade?

It extended restraint of trade doctrine beyond employment contexts to exclusive dealing arrangements and established duration as a key factor in reasonableness.

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