[IDEM libro tertio institutionum. ] §44.7.2.prConsensu fiunt obligationes in emptionibus uenditionibus, locationibus conductionibus, societatibus, mandatis.
[IDEM libro tertio institutionum.] Obligations are created by consent in buying and selling, letting and hiring, partnerships, and mandates.
§44.7.2.1Ideo autem istis modis consensu dicimus obligationem contrahi, quia neque uerborum neque scripturae ulla proprietas desideratur, sed sufficit eos, qui negotia gerunt, consentire.
Moreover, we say that an obligation is contracted by consent in these ways because no specific form of words or writing is required, but it is sufficient that those who transact the business consent.
§44.7.2.2Unde inter absentes quoque talia negotia contrahuntur, ueluti per epistulam uel per nuntium.
Hence, such transactions are contracted even between absent persons, for example, by letter or by messenger.
§44.7.2.3Item in his contractibus alter alteri obligatur de eo, quod alterum alteri ex bono et aequo praestare oportet.
Likewise, in these contracts, each is obligated to the other for that which one ought to perform for the other in accordance with what is good and fair.