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http://www.naturalgas.org/naturalgas/marketing.asp Physical and Financial Trading
There are two primary types of natural gas marketing and trading: physical trading and financial trading. Physical natural gas marketing is the more basic type, which involves buying and selling the physical commodity. Financial trading, on the other hand, involves derivatives and sophisticated financial instruments in which the buyer and seller never take physical delivery of the natural gas. То есть непосредственная торговля и торговля на финансовых рынках?
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