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Any factors that do not favor the free flow of funds can lead to price differences, for example: there is a price difference between BTC / USDT transactions on the Binance platform and Coinbase. If you buy BTC on Coinbase at a low price and immediately send it to Binance to sell it for a higher price, and you will have more USDT, then you can send USDT to Coinbase to buy BTC again and continue to profit from the spread! This is how smart robots work!