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Why is the stock market closed on the weekend?
Simply, most of the above given 'answers' are mere 'justifications' for a practice that has become anachronistic. It did make sense once in the past, but not any more. Computers and networks can run non-stop 24/7; even though the same human beings cannot be expected to work 24/7, we have invented the beautiful concept of multiple shifts; banks may be closed during nights and weekends, but banking is never closed in the internet era; ...The answer must lie in the vested interests of a few stakeholder groups - or - it could just be our difficult to change habits.