You keep saying &quot;shout in a pit&quot; as if that was the primary benefit of electronic trading. But of course, that&#x27;s not the primary benefit. The major benefit is that with humans out of the loop, it&#x27;s harder to grift huge amounts of money from people trying to do simple trades.<p>For instance: Google [odd eighths scandal].<p>And that&#x27;s a <i>modern</i> example of humans rigging the markets, exploiting lack of competition and automation. Things get much worse the further back you go in time.