Stock market rigging is no longer a ‘conspiracy theory’

I'm fascinated by exposes of stock market rigging. Michael Lewis's "Flash Boys" was one of the best things I've read about it.

http://www.amazon.com/gp/product/0393351599/ref=as_li_tl?ie=...

This columnist seems to be using the word "rigged" in a much narrower sense (a small discount being given to large purchases of foreign shares). When talking about stock market rigging, this really seems to be just a small part of the larger problem.