Learn why Citigroup's Vikram Bagri thinks Plug Power stock is a clear sell right now.Analysts can't seem to agree on Plug Power (PLUG 1.26%) stock. According to data compiled by FactSet, some analysts believe shares are worth $18 apiece, while others believe they're worth as little as $2. One of the biggest bears right now is Citigroup's Vikram Bagri, the analyst with a $2 price target. Why is Bagri so down on Plug Power stock? He recently listed four reasons he believes shares are a "sell." 4 reasons Bagri ...