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Yanis Varoufakis, Greece's outgoing finance minister, speaks to the media as he exits the finance ministry following his resignation in Athens, Greece, on Monday, July 6, 2015. European stocks dropped and the euro weakened as Greek voters' rejection of austerity sent investors to the relative safety of Treasuries, German bunds and the yen. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Yanis Varoufakis, Greece's outgoing finance minister, speaks to the media as he exits the finance ministry following his resignation in Athens, Greece, on Monday, July 6, 2015. European stocks dropped and the euro weakened as Greek voters' rejection of austerity sent investors to the relative safety of Treasuries, German bunds and the yen. Photographer: Chris Ratcliffe/Bloomberg via Getty Images