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http://www.cnn.com/2021/11/18/business/holiday-shopping-walmart-target-supply-chain/index.htmlCNNhttp://www.cnn.comThomas GoldsbyGlobal Supply Chain Institute, Supply Chain ManagementTop chains have long-term relationships with suppliers and the buying power to convince vendors to give them first priority when there are shortages, Thomas Goldsby, the Haslam Chair in Logistics at the University of Tennessee-Knoxville, said in an email. They have locked in contracts with vendors and struck agreements with logistics providers and carriers well in advance of the supply chain crisis, unlike small players who don't have the financial capability or scale to sign years-long contracts.