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Amazon created Prime Day essentially out of thin air. But the company’s standing in online shopping is so dominant that the event — a day-long sale for members of its Prime subscription service — has reached a level that’s comparable to more traditional retail holidays.

To give you an idea: Nearly 50 million Americans visited Amazon during its Prime Day event last year, according to a recent ComScore report charted for us by Statista. That’s only 10 million fewer than the number who visited Amazon on Cyber Monday, the first Monday after Thanksgiving…