[Red_Leaves_Flyy]

Grocers have been doing this for decades...

People have been doing this far longer.

There's nothing novel about putting stacks of toilet paper in warehouses near big populations.

[ceejayoz]

Pre-positioning staples like toilet paper isn't new, no.

Pre-positioning a few black truffles because one person thought about buying them yesterday is, though.

[smileybarry]

That's the large-scale strategy, but IIRC Amazon had per-buyer prediction. If you looked at a specific item and it predicted you're likely to order it soon, it would be delivered to a distribution center closer to you. (Using free space in a truck already heading there anyway)