The caveat is that you need to authorize the other adult's account, and that also means you can see one another's payment information.
That's fine if you're married or living together, but it's probably going to make people less likely to share free-shipping benefits with someone they don't completely trust. Amazon's new sharing option will make it harder for those of us who share Prime with people who don't live in our house, with whom we share our banking information already, to get free shipping.
The idea behind the service was always to drive additional revenue.
Prime members tend to buy a lot more product from Amazon than regular users. In 2014, Amazon raised the price of Prime from $79 a year to $99 a year, a move that doesn't seem to have slowed growth of the service.
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