Calculating economic costs should be done with respect to each nation. I would estimate Afghanistan suffered about $2.5 billion in losses from deaths of civilia

Calculating economic costs should be done with respect to each nation. I would estimate Afghanistan suffered about $2.5 billion in losses from deaths of civilians and insurgents. However their GDP increased by 5x covering those losses in a month or two. From an economic standpoint losing the war was the best thing to happen to Afghanistan. From the perspective of its citizens and culture though I think you would have to ask them.