Because cash and cash are two different concepts, when a bank buys cash, it can directly transfer the purchased foreign exchange to its foreign bank account without interest loss. However, when buying foreign currency cash, it needs to be kept in the bank's inventory for a period of time, so that enough foreign currency cash (such as 6,543,800 yen+0,000 yen) can be deposited in other banks to earn interest. Therefore, banks buy foreign currency cash with interest loss than buying cash. Of course, this part of the loss will be borne by the party selling foreign currency cash, so the cash purchase price in the bank quotation will definitely be lower than the cash purchase price, and this law will never change, just as the deposit interest rate will always be lower than the loan interest rate. Finally, the cash selling price is consistent with the cash selling price, because in this case, the bank has no interest loss, so the bank separately indicates the cash buying price, but there is no cash selling price.