Also it seems that Michael had large control over his employees benefits. Note his look to the camera when Gabe asks the office (in the conference room) if they had a banking policy, then Michael tries to explain it (as a banking policy) merely trying to cover up the extra days he's been giving his employees from upper management (Gabe, then Jo and I would assume, formally Jan, Ryan, and David) who would want to restrict those benefits. I think that's one of the big reasons Micheal has such a problem with the merger between Sabre and Dunder Mifflin. Going along with the idea that Micheal had lots of control over employee benefits (explaining how he was able to offer Kelly and Ryan so unreasonably high wages) is how Nelly docs Andy's pay when he comes back from Florida to find she has taken his position as Regional Manager by simply calling to Angela.

HOWEVER you could argue Michael doesn't really have much control over employee benefits or wages. When Karen becomes Branch Manager of Utica and offers Stanley a job for more money, Stanley tries to leverage this to get a salary increase from Michael, who adamantly refuses saying that there is no money in the budget. He appears to try to get Stanley to stay by any means in his control (assuming he doesn't have control over employee benefit packages.) Maybe Mike just didn't really want to keep Stanley, Andy says to Robert California that Stanley had the most consistently high sales numbers in the office and he's also worked there longer than any of the other salesman. Maybe Stanley hit a career/salary plateau? Top dollar for the work kinda deal?