I'm not so much interested in investing at all, but I'm fascinated by market structure details like these; it's like an Internet of money. It has extreme nerd value, regardless of its utility for profit seeking. :)
Also, the details in this article are implicated in all sorts of HN threads, so it's useful to have a place to link to when people start debating how market makers work or things like that.
Also, the details in this article are implicated in all sorts of HN threads, so it's useful to have a place to link to when people start debating how market makers work or things like that.