The World As Optimum Currency Area?

I was a little surprised to read in the Christmas edition of the Frankfurter Allgemeine Sonntagszeitung (not yet online, subscription wall, in German) that Robert Mundell seems to have changed his mind. In his seminal 1961 paper about monetary integration, he famously stated that “the optimum currency area is not the world”. Now it appears he favors a sort-of worldwide currency union, initially comprising Dollar, Euro, and Yen (apparently, he’s also made that point earlier this year in Lib?ration (subscription wall, in French)).
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