Excuse me?
As long as the $100 bill is the World currency...
Not to put *too* fine a point on it, but a U.S. $100 bill is pretty much impossible to spend in much of the world.
The U.S. sold printing tech and hardware to the Shah of Iran and his successors sold it to North Korea. They attempted to counterfeit enough $100 bills that no one in the world would accept them. They basically succeeded.
As a newly retired guy who will be doing more than a bit of traveling pretty soon, I've been researching this question far more than I ever thought I would. From what I can find out, in most of the world a U.S. $100 bill is assumed counterfeit by just about everybody. Even where they are accepted, only the most perfectly new and crisp ones are widely usable. (And, yes, this varies widely by location. Europe is less of a problem. There's so much U.S. drug money floating around in parts of South America that it's not a huge problem, with some countries actually using the dollar for their own currency. But in most of Asia, eastern Europe, and nearly all of Africa, the bills are simply rejected outright.)
The situation has also gotten better since the newest designs started coming out.
Still, I got a big smile from the idea that anybody could possibly think that "the $100 bill is the World currency." As far as I've been able to find out, that hasn't been true for a long, long time.
Any world travelers with recent, hands-on experience out there? Please correct me if I'm wrong.