[FrankFrank]

The market does not work in objective economic ways. The market prices different stocks because of various different factors - the weights of which are continuously changing. IMHO, this phenomenon is well explained by George Soros in his FT lectures from 2009: http://www.ft.com/indepth/soros-lectures

Some good examples or this behavior: - The run up in the overall market, and specifically in the Mortgage Backed Securities (MBS) and the eventual crash was not based on good economics and lasted for several years. - MDBX (MedBox) recent run up and correction is also a good example (TechCrunch, of all things, brought this to my attention) - The recent drop in DDD (3D Systems) after a negative Seeking Alpha article, is also an example of how the market doesn't always behave in objective economic ways.