How Many Euro Breakup Scenarios Are There?

In a short note at, I calculate that there are nearly a quadrillion different permutations for the 17-member eurozone to break up into various single currencies

With a “rump euro” remaining if k>0. What are your views? And is the euro really irreversible, or is that just one possibility out of 1,000,000,000,000,000?

Math is # 1! YP-17! Dedicated to Richard Geller (1946 – 11/1/11), who insisted on the former, and David Kelly, who will be undoubtedly pleased at how many seventeens cropped up here.