"[2] In theory you could beat the death spiral by buying good programmers instead of hiring them. You can get programmers who would never have come to you as employees by buying their startups. But so far the only companies smart enough to do this are companies smart enough not to need to."
-Paul Graham, What Happened to Yahoo http://paulgraham.com/yahoo.html
Edit: giving this another 30 seconds thought, it wouldn't surprise me at all if a friend of Mayer's sent her PG's essay when she first agreed to take the job. If she hadn't realized it already, she almost certainly would have seen this strategy as the correct one (use Yahoo's war chest to get more A-players into the company through acquisitions), and she's been executing on it ever since.