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Therefore you usually keep one variable fixed. E.g. the real GDP in prices of 2000. Or the inflation on this basket of products. This are both reasonable quantities.

Der Amerikaner ist die Orchidee unter den Menschen
Volker Pispers
by Martin (weiser.mensch(at)googlemail.com) on Sat Feb 28th, 2009 at 09:35:44 PM EST
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