The enigma of bronze age tin
phys.org
phys.org
If trade was falling off before that, it could be that the new iron swords coming out of northern Italy were driving down demand, and metal from the now useless bronze swords entering the market.
Hardly anything written for a few centuries after the Catastrophe survives, so the prospect of resolving the question seems dim.
[0] https://fallofcivilizationspodcast.com/2019/01/21/episode-2-...
There was clearly a hell of a lot going on all over Europe and Asia that didn't need cities or books.
I don't know if finding cloves from the Moluccas in a middle-class house in Syria in 2000 BCE is more, or less astonishing.