If progress has a price, kent Horsager is paying in spades. Three years ago the former grain trader decided to haul the Minneapolis Grain Exchange, founded in 1881, into the 21st century. The smallest of five agricultural exchanges in the U.S., it had been providing a tidy living for 60 or so traders, who sold futures contracts on spring wheat the old-fashioned way―the open-outcry method―to farmers, grain elevators and food companies like Cargill and General Mills.
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