The intriguing question raised by Mark Weidemaier’s superb new paper posted a few weeks ago (here) was whether, if a Euro area country hits a debt crisis, it would be mandatory for it to use the Euro CACs that are now part of the majority of Euro area sovereign bonds. Mark’s paper says no (for more, see also Tyler Zellinger, here; and Buchta, Shan, Plambeck & Shufro,