An estimated one-third of all shopping cart applications at Internet retailing sites have software holes that make them vulnerable to the price switching scam, said Peggy Weigle, chief executive of Sanctum Clara, Calif. For example, a major PC manufacturer sells a sleek new laptop for $1,600, but Weigle knows how to manipulate the company's shopping cart software code to change the price to $1.60. It's so easy, even novices can alter prices, she said.
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