Joseph E. Stiglitz and Martin Guzman write:   In the midst of the ongoing dispute between Argentina and the “vulture funds” that hold its bonds, a broad consensus has emerged concerning the need for sovereign-debt restructuring mechanisms (SDRMs). Otherwise, US Federal Judge Thomas P. Griesa’s ruling that Argentina must pay the vultures in full (after 93% of other bondholders agreed to a restructuring) will give free rein to opportunistic behaviors that sabotage future restructurings.   Argentina’s Bonds