[htek]

If I order an item from Amazon, Target, Mouser, and Walmart, they're probably going to arrive in four boxes by four different carriers under the Amazon system. If they all used USPS, they might all be delivered on the same day by one carrier.

[Scoundreller]

And yet it’s somehow cheaper than using USPS.

USPS has failed at taking advantage of its network effect.

[hakfoo]

The USPS may be burning their network effect benefits on universal service.

Sending a few letters from Manhattan to Nome for 50 cents snuffs out the profits from a lot of Amazon packages.