The figure is usually given in US dollars which due to changing currency exchange rates can distort the money's true street value so it is often converted using purchasing power parity (PPP) in which the actual comparative purchasing power of the money in the country is calculated.
On se često prikazuje u US dolarima zbog promjenjivih stopa valutne zamjene koja može iskriviti pravu uličnu vrijednost novca pa se često zamjenjuje upotrebom pariteta kupovne moći (PKM) u kojem se izračunava stvarna usporedna kupovna moć novca u zemlji.