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| ==Foreign Currency== | | ==Foreign Currency== |
| # Rashba respona 4:287 forbids lending money of one currency for another currency since the coins change fixed with respect one to another. | | # Rashba respona 4:287 forbids lending money of one currency for another currency since the coins change fixed with respect one to another. |
| ==Downpayments and early bird specials==
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| #Downpayments and early bird specials. 63b rav nachman says you can’t do an early bird special unless it is yesh lo. 65a he says you can do a downpayment and get the item now and pay more later as long as you don’t specify the price and tosfot 65b and 63b adds that if its price is evident in the market it is forbidden.
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| Rama 173:7 says you can do poskin on parah or talit even ein lo. That’s based on tosfot 63b that says if there’s no shuma then we’re not calling it agar natar we’re calling it tarsha. But what about the fact it might go up on its own like poskin al hapeirot?
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| Bear hagolah and tiferet lmoshe - peiro will have a shuma later but parah will never
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| Shach - parah is yatzah shaar in that the factors necessary to determine its price like per pound is shaar kavuah
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| Taz argues on rama and says its only if it didn’t go up
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| Chavot daat 173:11 there’s no shiybud haguf here if you give them a specific item, but there is for the general fruit which you can give them any fruit
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| Rav chaim in gemara and tos not rama - with ashray bmata that’s partially yesh lo
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| ==Future Contracts of Commodities== | | ==Future Contracts of Commodities== |
| # It is forbidden to pay in advance for the later delivery of a commodity since it is possible that the price of the commodity will rise. The two ways to permit this is if the seller has the commodity already or the marketplace price is already fixed.<ref>Shulchan Aruch Y.D. 163:1</ref> | | # It is forbidden to pay in advance for the later delivery of a commodity since it is possible that the price of the commodity will rise. The two ways to permit this is if the seller has the commodity already or the marketplace price is already fixed.<ref>Shulchan Aruch Y.D. 163:1</ref> |