That's because they produce for USA, Europe, China and the rest of the world...
Quite so. But less and less nowdays, as China's manufacturing sector shrinks....
The next question becomes: How much manufacturing will other countries take up in China's place, versus, instead, actually
decreasing the amount of stuff we manufacture? Via limited, manufacturing-on-demand with 3D printers, etc. -- and, for those with a lot of stuff, simply making-do with less stuff.
And now you've made me go re-watch the old George Carlin routine about "Stuff."
(Caution: language.)