As with many of these things, it’s more about the people than the technology; and to some extent about tradition
The people managing the market and everyone serious about trading on it have to be “on duty” whenever the market is open. If the market is open 6-7 hours a day, closed on weekends and public holidays and possibly for a lunch break, that fits nicely into a 9-5 job.
If market was open 24/7, all these people would have to work shifts; lot of extra hassle and expense, and for what? The extra hours wouldn’t really benefit anyone, it’s not like the economy is doing much at night anyway. It’s not like a power station or a hospital.
Everyone is already used to it, anyway; if they have a trade to make, they put it in when the market is open.
24/7 would also be worse for individuals and small firms; with the traditional “trading hours” market, an individual or a small team can fully take part, “on duty” from opening to closing. With 24/7, only organisations that can field multiple teams (to cover all the hours) could really participate fully.
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