Mr. Market is no longer a reliable indicator of stock price. Years ago, before the flood of Short Traders, the rise of ETFs, and the Macro Trader Mr. Market represented Investor sentiment. Now Mr. Market represents Short Traders. So you can have major distortions in price and relative price movement like today with GGP and PLD. It all depends on where Shorts are covering and where they are hanging in. Headlines are more important than the story to Shorts.