2.04 Under Roman sales law contracts for the sale of goods could be concluded without any formal requirements and with almost no restrictions as to the object of the contract.6 However, the contract was null and void due to initial impossibility where the goods to be sold had ceased to exist before the conclusion of the contract.7 In cases where the goods did not yet exist, a contract of sale only became effective if the goods later came into existence;8 the contract was then given retroactive effect.9
2.05 Generally speaking, Roman sales law was based on the sale of specific goods. The sale of unascertained goods as such was unknown even though stockpiling purchase was accepted.10 The sale of goods was generally understood to be a cash sale and, naturally, the goods to be sold had to be determined at the time of the conclusion of the contract.11 The purchase price had to (p. 9) consist of a determined or at least determinable sum of money. The purchase price further had to be meant seriously but did not have to be just.12
2.06 The Corpus Iuris Civilis generally placed the risk of loss with the buyer at that point in time where the contract was perfected.13 In case of stockpiling, purchase risk passed upon the separation of the goods from the stock.14
2.07 Under Roman law the seller was obliged to deliver the goods which had to be free from any right of the seller itself or third parties. Yet, the seller’s obligation was not the transfer of title15 which occurred with the handing over of the goods (traditio), if the seller was the owner.16 The seller, however, was liable in situations where third parties successfully claimed possession of the goods sold to the buyer and the buyer was then evicted.
2.08 Naturally, neither the category of impossibility nor that of delay directly deals with defective goods. This is due to the fact that, at first, this was only of significance where pieces of land had been sold.17 As the basic Roman concept for the sale of movable goods was that of cash sale, the goods sold were usually physically present to both parties.18 In the typical scenario the buyer therefore had the chance to see the goods before entering into the sales contract. Hence, liability for defective (movable) goods never became a general category comparable to ‘impossibility’ and ‘delay’. According to the classic Roman law the seller was only liable if it had given a special guarantee (stipulation) or if it had acted fraudulently (dolus).
2.09 However, in the field of slave and cattle trade—economically the most important markets at that time—two remedies for the buyer in case of defects were developed, the actio redhibitoria and the actio quanti minoris. For a period of six months the former entitled the buyer to the unwinding of the contract and the latter allowed a reduction of the purchase price.19 A claim for damages additionally required fault on the side of the seller. Although these rules were originally designed specifically for the trade of slaves, Iustinian later applied them to all sales of goods.20
2.10 With respect to defects in title, Roman law did not accept the acquisition of ownership in good faith.21 Therefore, where the buyer was sued by a third party, the buyer had an action against the seller who then had to defend it against the third party claim (actio auctoritate).22 If the third party succeeded, the seller was liable to the buyer for a sum that equalled double the purchase price. The actio auctoritate was, however, limited to cases where a res mancipi (p. 10) (land, slaves, certain types of cattle, rights as to the use of another’s property)23 had been sold. Nevertheless, in all other cases it had become common practice for buyers to stipulate the payment of the double purchase price (stipulatio)24 in case the goods delivered had a defect in title.25 If neither of these actions was available to the buyer, it could still resort to the actio empti if the seller had known of the third party right but not informed the buyer.26