I'm not saying that total GDP is necessarily the best metric for "richness" of a place, but it is a commonly used one. I think per-capita GDP is clearly a bett

I'm not saying that total GDP is necessarily the best metric for "richness" of a place, but it is a commonly used one. I think per-capita GDP is clearly a better metric, putting the US around 10th, but total GDP isn't an awful one for broad strokes.