I read that both in forex/futures when you enter an order, if you are in the trade winning 50$, another trader is losing 50$. Is there always this pairing of your orders being done?....
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As with all trading, you trade against other traders. One wins. The other has to lose.
In the spot Forex, retail traders are often trading again the brokers who often are the market makers. Unless you trade huge volumes like couple million dollars a day, they might take your order directly to their liquid providers such as Goldman Sachs where they match your order with large institutions. These brokers make money from the commission on your trading volume rather than trading against you.
Governments, multinational corps, sovereign funds, mutual funds, investment/insurance firms, wealth individuals and other large institutions often trade against each others through large settlement and clearing banks e.g. Goldman Sachs, UBS, Barclays, Nomura, Societe Generale, Credit Suisse, RBC, Commerzbank, Mizuho Bank. Their trade volume is astronomical. It reaches couple trillion dollars a day. One trade can be large as couple billions of dollars.
They are trading against each others for many purposes. For examples, some Arab oil traders wanted to hedge their currency risk for a month. They placed billions of dollars locked in positions. Some governments wanted to prevent their currency values from increasing. They dumped billions of their dollars buying another currencies.
Warren Buffet is real a bad Forex trader. He lost couple billions trading on spot Forex. He quit spot forex couple years ago. Instead he bought real estate in Israel to hedge currency risk to his oversea investment.