There is no floor on the Zimbabwe dollar.

It remains to be seen if there is a floor on the Argentine peso.

Bitcoin's floor is in the third world where it promises to replace cell phone minutes and bullets as a currency in Africa and reduce foreign currency fees for Assam tea traders.

Maybe Brad Delong cannot think outside the USA's borders but bitcoin is bigger than that.

*edit* here is a link to the 10 year chart of the Argentine peso v USD on xe.com.  As you can see, the value of the Argentine peso is exponentially shrinking:

http://www.xe.com/currencycharts/?from=ARS&to=USD&view=10Y