For the source text click/tap here: Bava Metzia 72
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Our mishnah teaches that one who wishes to advance money to a merchant in order for the merchant to provide him with produce at a later time may not fix a price for the purchase if the produce is not currently in the hands of the merchant or the market-price for the produce has not been set. The fear is that the buyer will give money to the merchant and then the produce will rise in value and it will be as if the buyer received a discount for having advanced the money. This is a form of interest since in return for giving his money in advance and letting the seller use them the buyer will get a greater deal of merchandise in return.
We explore the history of price-fixing in markets.