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Don't forget to use driverless vehicles to make deliveries (this is an ideal world, after all).

Hm, probably not. That might work in a suburban setting, but imagine someone in an apartment a couple floors up who orders a significant load of groceries.

It'd be much quicker for a person to cart the whole load to their door, rather than waiting for the customer to unload everything in a few trips. Driverless vehicles are feasible in the next decade or so, but delivery-robots not so much.

I'm not so sure. I could see delivery robots in a decade.

I see delivery robots being significantly easier to create than driverless cars. All you need is a shopping cart stuck on top of a set of stair-capable movement system, it's not like the thing needs to be dressed up as a butler.

Stairs are only a requirement for humans; drones can be far more flexible. Attach hoists to the side of the building, let them in through windows (or cut doors for them). Easier on both parties: no additional stairwell traffic, less chance of the drone tipping over and hitting someone.

Excellent point. Not necessarily practical everywhere, but a much better outside-the-box solution where it works.

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