Black Friday is one of the most chaotic shopping days of the year, with customers queuing for days and sometimes even resorting to violence in order to get their hands on the best deals.

But the post-Thanksgiving sales may not in fact be the best time to snap up low-priced merchandise, according to a new analysis.

Researchers found that around a third of products advertised as being on sale for the holiday have been available at lower prices earlier this year...

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