Bava Metzia 46: The Exchange Without the Stock
Talking Talmud - A podcast by Yardaena Osband & Anne Gordon
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More on exchange - including the question of using a coin as an indication of a formal act of acquisition. For it to work, he has to already have the coins in hand. Otherwise, it's too close to a sale. Also, Rav Nachman's opinion, the idea that money does effect the purchase by Torah law, and the exchange of money bags.