The price of US dollar in new york market is relatively low, so pound holders can buy US dollars in new york market (2.3 150) and sell US dollars in London market (2.3 130), making a profit:10000 * 2.3150/2.3/kl.

There are exchange rate differences in different markets. Buy in the low market, sell in the high market and get the difference.

The price difference refers to the futures price difference of different grades, different delivery months, different commodities and different delivery locations. It also refers to the price difference of the same commodity due to various conditions, such as wholesale and retail price difference, regional price difference and seasonal price difference. The difference between buying and selling goods is the main part of some businessmen's profits.