The maths of Greek debt

Zsolt Darvas of Bruegell does the maths of the Greek debt and comes to a trilemma:

1. no additional funding,
2. no restructuring of official loans, and
3. no default and exit from the euro.

Pick any two but not all three.

The FT in an editorial zeroes in on the IMF recently declared position that makes the solution to the trilemma urgent.