It's expected to be the busiest online shopping day of the year, but it may not be all good news for retailers.
Analysts warn that the latest retail data show average spending over the Thanksgiving weekend is falling.
This year, more than 131 million Americans are expected to go online for the shopping extravaganza nicknamed "Cyber Monday," according to data published by the National Retail Federation, up from 129 million in 2012.
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