It will be appropriate to first take into consideration the obligations of a seller who has not yet delivered the property sold. It is his duty to take care of it as a bonus paterfamilias, and if he does not stick to this obligation, the buyer would be entitled to damages, or, if, but only if the consequence of the seller`s negligence is that the thing sold substantially lowering itself from the thing offered, to refuse the contract and refuse acceptance of delivery.  Goods are only transferred with delivery if cash payment is made or credit is allowed. In Laing v SA Milling Co Ltd, Juta JA stated: “In the case of a sale of movable property followed by delivery, ownership will only be transferred when the buyer has paid the money or insured the seller, or when the sale is made on credit.”  In particular, the sale must be unanimous: for nearly 100 years, Norman`s right to buy and sell in South Africa has guided lawyers, students and businessmen through the intricacies of our right of sale. It is a book that has a loyal supporter. 9.6 – Effects of the sale under a suspensive condition 12.12 – Violation of the goods by an act of a third party at the risk of the buyer The most commonly used sales contract is the sales contract. A purchase and sale contract is a legally enforceable agreement between one party to the purchase and another to the sale. 9.8 – Effects of death of the contracting parties on conditional sales This type of contract is called “emptio rei speratae”. A classic example would be that Boucher agrees to buy Smith`s next crop of corn for R40 per sachet. Since the sale is maize, it appears at first glance as a generic sale, but it is distinctive for at least two reasons: for most ordinary and daily commercial transactions, the conclusion of a sales contract and the handing over of the property by delivery of the res are immediate. However, for some types of sale, there is a lag between the date of entry into the sales contract and the date of transfer of ownership and ownership. The question to be answered in these circumstances is: who benefits from the benefits of the res during this period and who bears the risk of causing harm during that period? In the absence of an agreement (explicit or implied) that a loan has been granted, any sale is considered a cash sale.
 The point is well illustrated in Daniels v Cooper.  Different things cannot be sold under South African law. Res extra commercium are among them….