But there are cases that fall into this third class of precedent where it will not be possible to involve the missing duration, and the agreement will fail because of uncertainty. In these cases, the court cannot write a contract for the parties. 73 (1) To the extent that they are not inconsistent with the express provisions of this Act, the rules of the common law, including the law of the merchant, and in particular the rules relating to the law of the contracting authority and the agent and the effects of fraud, misrepresentation, coercion or coercion, error or other inoperative grounds, continue to apply to contracts for the purchase of goods. Licensees are therefore encouraged to advise their client to obtain independent legal advice before their client signs a listing contract and/or a purchase and sale contract is concluded. 2. Nothing in this Act shall affect the validity of a contract of sale under a particular customary law or a legal authorization to purchase or the order of a competent court. 4. Where, under a contract of sale, ownership of the goods is transferred from the seller to the buyer, the contract shall be called purchase. 2. If the sale or rental is carried out by samples, as well as by description, it is not sufficient that the mass of the product conforms to the model if the product does not conform to the description. . .