How Amazon created the Prime membership program – Vox

But 15 years later, Amazon is worth more than $900 billion, compared to just $33 billion for its old foe eBay, which spun off its (more valuable) payment division, PayPal. And the Amazon Prime membership program is perhaps the biggest reason why.
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In 2009, I remember an old friend, who had just retired from Amazon, telling us we should all be on prime at our high school reunion. I already was. BTW, she had retired well before she 50.