“In the age of Queen Elizabeth all restraints of trade, whatever they were, general or partial, were thought to be contrary to public policy, and therefore void” he was clearly not intending the words “restraint of trade” to cover any contract whose terms, by absorbing a man’s services or custom or output, in fact prevented him from trading with others; so, too, the wide remarks of Lord Parker of Waddington in the Adelaide case. It was the sterilising of a man’s capacity for work and not its absorption that underlay the objection to restraint of trade. This is the rationale of Young v Timmins, where a brass foundry was during the contract sterilised so that it could only work for a party who might choose not to absorb its output at all but to go to other foundries, with the result that the foundry was completely at the mercy of the other party and might remain idle and unsupported. The doctrine does not apply to ordinary commercial contracts for the regulation and promotion of trade during the existence of the contract, provided that any prevention of work outside the contract, viewed as a whole, is directed towards the absorption of the parties’ services and not their sterilisation. Sole agencies are a normal and necessary incident of commerce and those who desire the benefits of a sole agency must deny themselves the opportunities of other agencies. So, too, in the case of a film-star who may tie herself to a company in order to obtain from them the benefits of stardom (Gaumont-British Pictures Incorporated v Alexander). See, too, Warner Brothers Pictures Incorporated v Nelson. And partners habitually fetter themselves to one another. When a contract only ties the parties during the continuance of the contract, and the negative ties are only those which are incidental and normal to the positive commercial arrangements at which the contract aims, even though those ties exclude all dealings with others, there is no restraint of trade within the meaning of the doctrine and no question of reasonableness arises. If, however, the contract ties the trading activities of either party after its determination, it is a restraint of trade, and the question of reasonableness arises. So, too, if during the contract one of the parties is too unilaterally fettered so that the contract loses its character of a contract for the regulation and promotion of trade and acquires the predominant character of a contract in restraint of trade. In that case the rationale of Young v Timmins comes into play and the question whether it is reasonable arises.”