The dollar is appealing because you can buy US treasuries for however much you have of it (because America's debt appetite is almost unlimited). I don't think y

The dollar is appealing because you can buy US treasuries for however much you have of it (because America's debt appetite is almost unlimited). I don't think you do that with the Euro yet, holding it would be much more complicated because you couldn't stash large amounts of it as easily into bonds. Also, the EU might not like being a reserve currency, and can do what the swiss did when CHF was used abroad too much: negative interest rates.