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A pro-European Union protester waves an EU flag during a demonstration in front of the parliament in Athens on June 30, 2015. 2015.   Thousands of people rallied in Athens in support of a bailout deal with international creditors which has been rejected by Prime Minister Alexis Tsipras, leaving Greece on the brink of default.  AFP PHOTO / ARIS MESSINIS        (Photo credit should read ARIS MESSINIS/AFP/Getty Images)
A pro-European Union protester waves an EU flag during a demonstration in front of the parliament in Athens on June 30, 2015. 2015.   Thousands of people rallied in Athens in support of a bailout deal with international creditors which has been rejected by Prime Minister Alexis Tsipras, leaving Greece on the brink of default.  AFP PHOTO / ARIS MESSINIS        (Photo credit should read ARIS MESSINIS/AFP/Getty Images)

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    How Greece tests the EU

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How Greece tests the EU

London Business School Associate Professor Michael Jacobides talks about how the Greece debt crisis is testing the strength of the European Union.

How Greece tests the EU

London Business School Associate Professor Michael Jacobides talks about how the Greece debt crisis is testing the strength of the European Union.