Black Friday used to be a single day of shopping excess. People woke up early the day after Thanksgiving, headed to malls, and fought over deeply discounted sweaters, coffee makers, and TVs. If you looked hard enough, you could find amazing deep discounts amid piles of questionable “bargains.” A while later online retailers cooked up Cyber Monday in a bid for some of that free flowing cash. Over time, Black Friday and Cyber Monday melted together to form one long, holiday weekend of...

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