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Comment by lambda | Hacker News Reader

Or as they say, the market can remain irrational longer than you can remain solvent.

More specifically, as John Maynard Keynes said

Not according to http://quoteinvestigator.com/2011/08/09/remain-solvent/. Apparently what Keynes said was something similar, but not that same phrasing:

  There is nothing so disastrous as a rational investment 
  policy in an irrational world.

And in the long run we are all dead anyway.