I don't have it in my hand. How can I sell it? The answer is: banks provide loans.

Why did the bank lend you money? Because you paid a deposit.

Sell euros and buy dollars, that is, sell the currency pair EURUSD.

The bank will lend you 50 euros first. At that time, you thought the price was higher, so you sold the euro. Suppose you sell $65,438+000 and you have it in your hand. Later, after a while, you felt that the euro had almost fallen, and you needed to buy it and return it to the bank. At this time, if you only spend $80 to buy 50 euros, you can take out $80 to buy 50 euros and return it to the bank. You made an extra $20 in your pocket.

It used to be the relationship between 100 and 50 euros, but now it is the relationship between 80 dollars and 50 euros, and the euro has fallen.

I don't know if you understand.

If you still don't understand, look at the events of the Asian financial crisis.

If you can't find it, contact me and give you more information.