us default could be disastrous choice for.., page-10

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    http://en.wikipedia.org/wiki/Government_bond

    Government bonds are usually referred to as risk-free bonds, because the government can raise taxes or create additional currency in order to redeem the bond at maturity. Some counter examples do exist where a government has defaulted on its domestic currency debt, such as Russia in 1998 (the "ruble crisis"), though this is very rare. As an example, in the US, Treasury securities are denominated in US dollars. In this instance, the term "risk-free" means free of credit risk. However, other risks still exist, such as currency risk for foreign investors (for example non-US investors of US Treasury securities would have received lower returns in 2004 because the value of the US dollar declined against most other currencies). Secondly, there is inflation risk, in that the principal repaid at maturity will have less purchasing power than anticipated if the inflation rate is higher than expected. Many governments issue inflation-indexed bonds, which protect investors against inflation risk by increasing the interest rate given to the investor as the inflation rate of the economy increases.
 
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