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Wary financial markets are watching the decline in copper, to see if the red metal is acting as a fire alarm for the global economy.
CNBC's Courtney Reagan looks at today's leading and lagging stocks.
Andrew Left, Citron Research founder and editor, thinks Plug Power is worth 50 cents, and questions the company's management.
Plug Power's stock hit $12 today, but Andrew Left, Citron Research founder and editor, thinks the stock is worth $0.50.