Do you have any idea how much you’re paying for Amazon Prime? If you said, “Probably around $100 a year,” try again. You might be spending a whopping $320 a year and not even realize it. Let me explain.

Priming the pump

Come with me back to Feb. 2, 2005. That’s when Amazon announced that for $79 a year, you could get free two-day shipping on most items with no minimum purchase. They kept it at that price until 2014. Then it jumped to $99 a year.

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