It doesn't matter, because Nigerians aren't going to be buying high-priced stuff internationally anyway, given that their income is so low (by any measure).
It gives a pretty good approximation of what the country's production means to people living in the country, as opposed to the striaght GDP numbers which often don't mean anything. Even first world currencies often go up or down 10 or 15% in a year without a significant effect on inflation in that country. That means that the country's GDP will spike or dip by that much without any real consequences on the populace, which makes GDP a rather haphazard way of judging the country's production.
It gives a pretty good approximation of what the country's production means to people living in the country, as opposed to the striaght GDP numbers which often don't mean anything. Even first world currencies often go up or down 10 or 15% in a year without a significant effect on inflation in that country. That means that the country's GDP will spike or dip by that much without any real consequences on the populace, which makes GDP a rather haphazard way of judging the country's production.
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