I would like to understand all the nitty-gritty deails behind those numbers. 1. How are work hours measured, do they include overtime, etc. 2. How is "product

I would like to understand all the nitty-gritty deails behind those numbers. 1. How are work hours measured, do they include overtime, etc. 2. How is "productivity" measured? Eg: if an American company has a factory in China, then are the man-hours in those factories accounted for in a reasonable way, because the profits of those products are probably being counted. Or maybe the measures only calculate the value added by American workers.