[GAIUS libro secundo rerum cottidianarum. ] §19.2.2.prLocatio et conductio proxima est emptioni et uenditioni isdemque iuris regulis constitit: nam ut emptio et uenditio ita contrahitur, si de pretio conuenerit, sic et locatio et conductio contrahi intellegitur, si de mercede conuenerit.
[GAIUS, Everyday Matters, book two.] Letting and hiring is very close to sale and purchase and rests on the same legal rules: for just as sale and purchase is contracted if there is agreement on the price, so too letting and hiring is understood to be contracted if there is agreement on the rent.
§19.2.2.1Adeo autem familiaritatem aliquam habere uidentur emptio et uenditio, item locatio et conductio, ut in quibusdam quaeri soleat, utrum emptio et uenditio sit an locatio et conductio.
Moreover, sale and purchase, and likewise letting and hiring, seem to have such a close affinity that in certain cases it is commonly asked whether it is sale and purchase or letting and hiring.
ut ecce si cum aurifice mihi conuenerit, ut is ex auro suo anulos mihi faceret certi ponderis certaeque formae et acceperit uerbi gratia trecenta, utrum emptio et uenditio sit, an locatio et conductio? sed placet unum esse negotium et magis emptionem et uenditionem esse.
As, for example, if I agree with a goldsmith that he should make rings for me out of his own gold of a certain weight and a certain shape, and he receives, for instance, three hundred, is it sale and purchase or letting and hiring? But it is held that it is a single transaction and is rather sale and purchase.
quod si ego aurum dedero mercede pro opera constituta, dubium non est, quin locatio et conductio sit.
If, on the other hand, I provide the gold and a rent is established for the work, there is no doubt that it is letting and hiring.