Alternatively, http://en.wikipedia.org/wiki/Working_Group_on_Financial_Markets http://en.wikipedia.org/wiki/Working_Group_on_Financial_Mark... I've never been

Alternatively, http://en.wikipedia.org/wiki/Working_Group_on_Financial_Markets http://en.wikipedia.org/wiki/Working_Group_on_Financial_Mark... I've never been very convinced on the alleged pervasiveness of the PPT. It seems like a convenient catch-all in most cases (i.e. misattribution of an error term.) That being said, the after-hours returns are a bit unnerving.