We know it sounds like putting a square watermelon in a round hole: but Wal-Mart claims it is the nation's largest buyer of locally grown produce. The scaling of centrally managed industrial agriculture in the USA will be transformed. More changes are coming. Wal-Mart Stores Inc. plans to buy and sell $400 million worth of produce grown by local farmers within its state stores this year, an effort the company says will only grow. One obvious upshot is diversification of the supply chain. Smaller contracts with more farmers & distributors. ...