On the left are the Bid prices of the exchanges and on the top the Ask prices. In the tables are the price differences listed that can be used for arbitrage trading.

The difference in prices on the different exchanges can be used to make a profit without any risk (theoretically). If the ASK price on one exchange is lower than the BID price on another, this difference can be used to buy on one exchange and sell directly on another. This is called arbitrage trading. The reason why prices on some exchanges are much higher is that it can be difficult and time consuming to transfer the profit out of the exchange. The more difficult this is the greater the price difference. Also trading and withdraw fees can make arbitrage trading less profitable.