I am at a company of 70 and we seem to still be not-stupid. But I think the general rule is correct; we don't have stupid here because nobody has time for it, a

I am at a company of 70 and we seem to still be not-stupid. But I think the general rule is correct; we don't have stupid here because nobody has time for it, and anyone who isn't pulling their weight is conspicuous and gets cut loose eventually. My guess is that once headcount is over 100, the organizational details start to become too large to fit in any one person's head, and that creates blind spots in which stupid people can go unnoticed. And if you get even larger than that, at some point stupid people just become part of the cost of doing business that shareholders are happy enough to put up with as long as the stupidity is contained and doesn't obviously diminish their returns.