No dude.

When you click 'buy', the item that they shipped 2 weeks in advance (because they sell on average x units per day) that just arrived in port yesterday and arrived in the warehouse 3 hours earlier is allocated to you and shipped out. It arrives at your local distribution hub 1 dday later, and your home same day or the next (1-2 day shiping)

And had you waited 24 hours before buying, you'd have gotten the item that arrived on the ship the following day. They order and receive constantly, in advance.

If enough orders are placed for that item from that warehouse, the supply tally will decrease to a preset replenishment level

No. They do not keep 10,000 units on hand, then place an 8k order when it hits 5,000, so they get back up to to 10,000 when their 2 week shipment finally arrives when they are then below 2k units and running real low. That's 90's fullfillment. Amazon broke the model by going 'just in time' and being able to offer lower prices in part due to needing a tiny fraction of the amount of warehouse space.

If they sell 500 units a day. They have 500 units arrive every day, with maybe a few hunded more as a buffer. The consequence is an insanely lowered warehouse footprint which saves a ton of money and allows them to redirect and instead open ton of region 'distribution' centers rather than larger stocking facilities - this regionality then allows for 1-2 day shipping.

All because they do what you can't fathom as actually being possible - have the item you purchase ordered and on a boat two weeks before you hit the buy button, using predictive statistical modeling, dynamic pricing, and product nudging (they order too much of something, it shows up in your feed for less, they order two few and it shows up costing more and you get shown alternatives first)

This is (in part) how Amazon stole the market.

No dude.

When you click 'buy', the item that they shipped 2 weeks in advance (because they sell on average x units per day) that just arrived in port yesterday and arrived in the warehouse 3 hours earlier is allocated to you and shipped out. It arrives at your local distribution hub 1 dday later, and your home same day or the next (1-2 day shiping)

And had you waited 24 hours before buying, you'd have gotten the item that arrived on the ship the following day. They order and receive constantly, in advance.

If enough orders are placed for that item from that warehouse, the supply tally will decrease to a preset replenishment level

No. They do not keep 10,000 units on hand, then place an 8k order when it hits 5,000, so they get back up to to 10,000 when their 2 week shipment finally arrives when they are then below 2k units and running real low. That's 90's fullfillment. Amazon broke the model by going 'just in time' and being able to offer lower prices in part due to needing a tiny fraction of the amount of warehouse space.

The consequence of lowered warehouse space is that they could open up a ton of region 'distribution' centers rather than larger stocking facilities which allowed for 1-2 day shipping.

All because they do what you can't fathom as actually being possible - have the item you purchase ordered and on a boat two weeks before you hit the buy button, using predictive statistical modeling, dynamic pricing, and product nudging (they order too much of something, it shows up in your feed for less, they order two few and it shows up costing more and you get shown alternatives first)

This is (in part) how Amazon stole the market.

No dude.

When you click 'buy', the item that they shipped 2 weeks in advance (because they sell on average x units per day) that just arrived in port yesterday and arrived in the warehouse 3 hours earlier is allocated to you and shipped out. It arrives at your local distribution hub 1 dday later, and your home same day or the next (1-2 day shiping)

And had you waited 24 hours before buying, you'd have gotten the item that arrived on the ship the following day. They order and receive constantly, in advance.

If enough orders are placed for that item from that warehouse, the supply tally will decrease to a preset replenishment level

No. They do not keep 10,000 units on hand, then place an 8k order when it hits 5,000, so they to 10,000 when their 2 week shipment finally arrives whn they are below 2k and running real low. That's 90's fullfillment. Amazon broke the model by going 'just in time' and being able to offer lower prices in part due to needing a tiny fraction of the amount of warehouse space.

The consequence of lowered warehouse space is that they could open up a ton of region 'distribution' centers rather than larger stocking facilities which allowed for 1-2 day shipping.

All because they do what you can't fathom as actually being possible - have the item you purchase ordered and on a boat two weeks before you hit the buy button, using predictive statistical modeling, dynamic pricing, and product nudging (they order too much of something, it shows up in your feed for less, they order two few and it shows up costing more and you get shown alternatives first)

This is (in part) how Amazon stole the market.