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You may be confusing the exchange with a broker. With a serious commodities broker, you’re using the services of the broker to trade on an exchange, e.g. the CME. The broker does not particularly care whether you make or lose money, so long as you don’t actually go negative.

In the US, securities brokers are very heavily regulated — see “regulation NMS”.

I don't think so (I am not an expert though so it's possible), my point was that even if the exchange, not just your broker, blows up, the thing you were buying and selling is a real thing anyway, unlike in a Bucket Shop.

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