Quote from Trajan:
I think, generally, it is for large groups/firms now. Edge is virtually nonexistent. So what edge there is has to be put on for larger size, hence, higher capital requirements. Second, most locals aren't very sophisticated quatitatively or technologicaly. With tight edge, there isn't much room for error. Whereas before, if there was .10 or .15 cents worth edge, your pricing didn't matter as much. That has changed and you need to be able to make markets when everything is close to being efficient. Also, technology is expensive and takes brain power. These things can be overcome with resources that only larger groups and firms can afford. That's my .02 cents anyways.