> ..in "Dark Pools", they discuss how some of these traders would call up Nasdaq wondering why a certain trade did or didn't work how it did. And they'd find ou

> ..in "Dark Pools", they discuss how some of these traders would call up Nasdaq wondering why a certain trade did or didn't work how it did. And they'd find out all sorts of strange rules. Which makes me wonder, wtf? Are Nasdaq's rules hidden? Or were people doing this as a living just too lazy to read the specs? Sometimes the functionality is obscure or poorly documented, so it's difficult to understand how it will work, or you make an assumption that turns out to be wrong. Sometimes, different order types interact in unexpected ways (these are effectively complex systems). Sometimes, the exchange just gets it wrong. On a number of occasions, I've investigated an incident and it turned out that there was a bug at the exchange's end.