RE: be careful in the short termAccording to Yahoo finance, MAs revenue is 40.1B and Visa's is 5.84B. I read on Marketwatch.com that V EPS for 2008 is expected in the $2 per share range. Giving a slightly better FWD PE for V vs MA's 29* forward earnings (say 32 - 35) I would say the fair value is somewhere around $65 - $70.