As Marc Faber points out:
"However, the one thing I am certain about is that the US dollar has already lost
two functions of paper money: it is no longer an useful store of value (at zero
interest rates) and it is no longer a meaningful unit of account. I should add that
at some point the US dollar could lose the third function of paper money, which
is facilitating the exchange of goods and services, since more and more
countries trade in other currencies than dollars. Above, I was kind to dollar
holders and valued the S&P 500 in Swiss Franc (down 50% since 2000). If I
valued the S&P in gold the performance would be far worse."