My view is... if the USA loses its super power status to other countries (possible scenario some time in the future) then the US $ would cease to be the international trading currency and the new super powered Country's currency takes its place.. and analysts will use that currency as an indicator factor instead.
The big fish in the small pond behaviour???
With the growth rate of China far exceeding that of the USA...analysts are forecasting that China's economy will be bigger than USA sometime in the 2020 decade....and the US $ currency debate will intensify as that decade nears.
The USA seems to be a little uneasy in losing this top dog status (obviously) as other less USA friendly countries are gaining more economic power such as the BRIC group.
Of interest
Growth Potential
Annual Growth rates 2011-2050
Brazil +4.3%
Russia +2.8%
India +6.3%
China +5.2%
source : Goldman Sachs
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