Readers are familiar by now with the broad-based commodity rally, with energy, agricultural products and metals moving sharply higher as former Goldman Sachs commodities head Jeff Currie warned this summer of growing scarcity in the physical economy. The Bloomberg Commodity Index has climbed to levels last seen in 2012... ... while the Quantix Commodity Index has hit a new record high. Bloomberg macro strategist Simon White is out with a new note this morning warning that the commodity rally is threatening…