It's the most wonderful time of the year--for the U.S. economy. Over the Thanksgiving weekend, 226 million shoppers visited stores and websites for big sales. Then on Monday, more buyers hit the Internet. According to comScore, these sales reached an estimated $1.25 billion. That makes it the biggest online shopping day ever.

But experts are still worried about the economy. Mark Vitner is an analyst for Wells Fargo. He said that even if sales are good, it may not be enough to help the economy. "I think this will be a good holiday shopping season," he said. "But the question is, What will happen after that?"

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