While stock trading might appear to be fully automated, it really isn’t. There are large numbers of “market makers,” living, breathing human beings who are like middlemen making razor-thin profits on most of their trades. These people provide a *lot* of the necessary liquidity for markets to operate efficiently.
Since these are real people, they like to put in their hours and then go home, maybe eat BBQ on Saturday evening.
There are “after hours” trading sessions before and after the usual 9:30 am – 4:00 pm trading hours, and they are noticeably less price efficient (since the market makers aren’t working).
Could stock markets eventually be made fully automated? Possibly, but the existing system has been in place for a long time, and it works just fine.
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