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> and actually I feel slightly embarrassed when I see a new package arrive.

Same, but even more so when 6 different packages arrive staggered throughout the day. I have never understood how that is more efficient than 6 boxes at once, or 6 things in 1 box at once.






One of the best features Amazon added in recent years was the delivery day option where they group things together. I assume the fact that they give 6% cash back when you choose that means they do indeed benefit from aggregation

They come from different places, and delivery vans have different routes which mean they have a small marginal cost.

As an engineering it's fairly simple to understand.




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