Over time, Black Friday and Cyber Monday blended together to form one long, holiday weekend of sales. Then that four day period gradually morphed into sales throughout November. Recently they even began leaking into October, and that looks to be the case again this year. But big unknown factor for 2021 isn’t when Black Friday starts. It’s how shipping delays and backups at major ports will affect product availability—and prices . If everything’s selling as fast as it...

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