[pjc50]

That would cost Amazon money.

Besides, the rules around country of origin are complicated, and some countries have product description law about this. And what's to stop Amazon sellers sticking fake country of origin on, as they can already do for CE marking?

Or the reverse: Amazon stick a China flag on iPhones. Apple are going to get extremely upset about this and sue/offer money to change that to a US flag.

The https://en.wikipedia.org/wiki/Israel_Anti-Boycott_Act may make it illegal to force Israeli sellers to identify their country of origin.

[juiyout]

Amazon could do A-B tests on this. This might just earn them more money instead.

[pjc50]

How do they get the information, though? Oblige resellers to put it on? Who then proceed to lie about it? It's just the "fake commingling" problem all over again.