It evolved to be the way that it is. Used to be you needed a set group of people in the building to make the trades work.
You might think that these days it would be open 24/7 with computers now, but the reality is that as soon as there was a need for something like that the market just established something that is effectively the same thing. You can trade “futures” during non-business hours on a different exchange there are basically just proxies for what the market is doing when it’s closed. It’s basically betting on the price at the opening of business the next day — so pretty much the same thing in many respects as just buying and selling the actual thing.
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