If you order from your local bookstore a book which is being sold on Amazon as a PoD copy by a major publisher, what do you think happens?
They don't have a separate manufacturing process for mom-and-pop bookstores. Amazon do the printing and the logistics but deliver the book to the store instead of to your house so that the store can hand it to you and collect a very small amount of money.
> If you order from your local bookstore a book which is being sold on Amazon as a PoD copy by a major publisher, what do you think happens?
Nothing. Local bookstores (not just 'mom-and-pop', but national chains or cooperatives) would tend not to have that title available. Is that a US thing that they would order from Amazon? Printing-on-demand is potentially interesting, but just not a thing for most titles.