Pretium verum

In conclusion then, the price generally had to consist in money. Furthermore, it had to be verum and certum but not necessarily iustum. The first of these requirements was fairly straightforward: "Cum in venditione quis pretium rei ponit donationis causa non exacturus, non videtur vendere."^[1293] The price had to be seriously meant; otherwise the transaction was merely a donation in disguise. That the price was very low did not in itself invalidate the sale, as long as the vendor seriously intended to demand it. Only if it was derisory ("nummo uno" )^[1294] could it normally be assumed^[1295] that the parties did not actually have in mind the conclusion of a genuine contract of sale.

3.