Since coming to power in January, the Greek government, led by Prime Minister Alexis Tsipras’s Syriza party, has believed that the threat of default – and thus of a financial crisis that might break up the euro – provides negotiating leverage to offset Greece’s lack of economic and political power. Months later, Tsipras and his finance minister, Yanis Varoufakis, an academic expert in game theory, still seem committed to this view, despite the lack of any evidence to support it.