The Internet has made buying things as effortless as possible. You don't need to go to the store or even roll out of bed. You don't have to bother with cash, and in places where you frequently shop, you can do without pulling out a card either. A series of mouse clicks or finger taps is all it takes.

The inverse isn't so simple. Mailing packages typically requires making a trip to the nearest postal service and wrestling with packaging.

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