The holiday shopping season got off to a surprisingly solid start, according to data released Saturday by a research firm. But the sales boost during the post-Thanksgiving shopathon came at the expense of profits as the nation's retailers had to slash prices to attract the crowds in a season that is expected to be the weakest in decades.

Sales during the day after Thanksgiving rose 3 percent to $10.6 billion, according to preliminary figures released Saturday by ShopperTrak RCT Corp., a Chicago-based research firm that tracks sales at more than 50,000 retail outlets. Last year, shoppers spent about $10.3 billion on the day after Thanksgiving, dubbed Black Friday because it was historically the sales-packed day when retailers would become profitable for the year.

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