Según Gros, el problema principal de los PIIGS no es el déficit público, sino el déficit exterior:
External versus domestic debt in the euro crisis
me quedo con las conclusiones:
Implications for the Eurozone crisis
My argument that foreign debt is more important than public debt has a number of implications the ongoing Eurozone crisis:
Ireland, which is on course to run a current-account surplus this year and which has an overall small net international debtor position (about 20% of GDP) should be able to withstand the crisis much more easily than countries like Portugal or Greece which are still running sizeable current-account deficits and which have very large net international debtor positions (about 100% of GDP).
It might be more important for Greece (and Portugal) to achieve an external (current-account) surplus than a fiscal (primary) surplus.
In order to restore the creditworthiness of a country policymakers need to cut its foreign debt, not just public debt in general.
Given that by now only about one-half of all Greek government bonds are held by private foreign residents, it will be difficult to solve the problem by defaulting on government debt alone.
Según Gros hay que enfocarse más en la deuda exterior que en la deuda pública y afirma que en el caso de Grecia el "default" no terminaría de arreglar sus problemas.