The author is a Reuters Breakingviews guest columnist. The opinions expressed are his own.
Greek Finance Minister Euclid Tsakalotos attends a parliamentary session in Athens, Greece, July 15, 2015. REUTERS/Christian Hartmann
A pro-Euro protester holds a European Union and a Greek national flag during a rally in front of the parliament building in Athens, Greece, July 9, 2015. REUTERS/Alkis Konstantinidis
Pro-Euro protestors hold Greek national flags during a pro-Euro rally in front of the parliament building, in Athens, Greece, June 30, 2015. REUTERS/Yannis Behrakis
A pensioner argues with an official as he tries to enter a National Bank branch to receive part of his pension in Athens, Greece, July 6, 2015. REUTERS/Christian Hartmann
A couple makes a transaction at an automated teller machine outside an Attica bank branch in central Athens, August 28, 2012. REUTERS/John Kolesidis
A pensioner waits outside a branch of the National Bank to receive part of his pension in Athens, Greece, July 7, 2015. REUTERS/Yannis Behrakis
An anti-austerity 'No' voter waves a flag with the name of Prime Minister Alexis Tsipras as he celebrate the results of the first exit polls in Athens, Greece, July 5, 2015. REUTERS/Marko Djurica