Why Does Digital Assets Traded to Local Currency (Fiat) Appear to Be Lesser ?

Since the price of digital assets fluctuates in real time, the price of digital assets after buying or selling are subject to changes although the quantity of digital assets remained the same.

For example: To buy 100 USDT from AOFEX OTC platform, the unit price of USDT is 6.8 CNY therefore the buyer pays 680 CNY. If the unit price of USDT after buying changes to 6.5 CNY, the same amount of 100 USDT to buy again or sell at this time would be 650 CNY. However quantity of 100 USDT in such case remaining unchanged. The floating unit price of digital assets in this case causes the buyer to pay or seller to receive lesser in local currency (fiat).