Whilst this is true, there is some distortion to that statement with measuring by value. If I produce a screw for the US military (a scenario where supply chains are highly regulated and thus may be unable to buy cheap from a foreign country) and sell it for $1, I have produced a dollar of manufacturing by value, but If I produce exactly the same product in China for $0.1, I've only made 10 cents by value, despite the fact I have made exactly the same product.
There is a reason why for instance ships and raw materials output is measured in tonnage, since that is the actual thing produced, the value is secondary to that. That is you would want to measure the actual amount of goods produced rather than what they sold for, obviously only amongst comparable categories.
There is a reason why for instance ships and raw materials output is measured in tonnage, since that is the actual thing produced, the value is secondary to that. That is you would want to measure the actual amount of goods produced rather than what they sold for, obviously only amongst comparable categories.