At what point the sale takes effect: Eruvin 81a-b; Gittin 10b; Kiddushin 26a, 28b, 28b-29a
Types of Property
Whether acquisition can be official with presentation of a legal document, before the money changes hands: Kiddushin 26a
How much one must pay, minimally, to acquire "Bound Property": Kiddushin 13a
Acquisition via a transfer of money, without any other act
Whether mere transfer of funds could complete a transaction, biblically: Eruvin 81b; Bava Metzia 47b-48a; Bechorot 13a-b
The sages banned reliance on a mere transfer of funds to seal a transaction, requiring instead movement of the commodity to be acquired, lest a seller be able to come and tell a purchaser, "Your wheat was consumed by a fire," rather than force the seller to try and save it: Eruvin 81b; Bava Metzia 46b-48a
Whether mere transfer of funds is effective if the items to be acquired are in an area owned by the purchaser: Bava Metzia 49b
There are four times of year when a purchaser may force a butcher to slaughter an animal even if he cannot afford to buy the whole animal, by order of the Sages. Because of the risk for the butcher, the sages enacted that the simple transfer of money performs the transaction, and if something happens to the animal before the purchaser acquires it, the purchaser still loses his investment. Alternatively, the butcher gives it to someone to acquire for the purchaser: Eruvin 81b
One may acquire Movable Property along with "Bound Property", if he acquires the "Bound Property" with Money, a Document, or by Physically Taking Control of the Land: Gittin 22a; Kiddushin 7a, 26a; Bava Kama 12a-b
