"Only $4 of an iPod that costs $150 to produce is made in China"
online.wsj.com
online.wsj.com
It matters because it misrepresents the trade deficit, which is a sensitive political issue. As the article points out, the real U.S. trade deficit with China may actually be 30% lower while the trade deficit with Japan may actually be 25% higher.
There is a Japanese proverb you may have heard of called "The nail that sticks up gets hammered down." There are a few ways to spin it, but they all suggest not being that nail. Making China be that nail instead? That's like triple bonus points. (China and Japan have a... storied relationship with each other.)
Let's say your country exports wood, and you have imported screws. If you export furniture, do you assume it is built using screws, and measure the country's added value by subtracting the value of the screws from the value of the furniture? Or maybe you believe it is glued, but actually uses screws - now you have overvalued.
And what if you import another, more expensive kind of screw from Japan, which looks identical but has different properties? Do you know which ones are being exported, and therefore what value the country is actually adding? And to think this is only a simple example!
Unless you are interested in seeing the delta per country you trade with. But what use is that number?
http://www.nytimes.com/2007/06/28/business/worldbusiness/28s...
$73 of the $299 price was a Japanese hard drive. $80 went to Apple in America.