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A pensioner reacts as he listens from a bank employee that he is not going to receive his pension after waiting for hours outside the National bank of Greece headquarters in Athens, Monday, June 29, 2015. Anxious Greek pensioners swarmed bank branches hoping to be able to receive their pensions Monday and others lined up at ATMs as they gradually began dispensing cash again on the first day of capital controls imposed in a dramatic twist in Greece's five-year financial saga. (AP Photo/Petros Giannakouris)
A pensioner reacts as he listens from a bank employee that he is not going to receive his pension after waiting for hours outside the National bank of Greece headquarters in Athens, Monday, June 29, 2015. Anxious Greek pensioners swarmed bank branches hoping to be able to receive their pensions Monday and others lined up at ATMs as they gradually began dispensing cash again on the first day of capital controls imposed in a dramatic twist in Greece's five-year financial saga. (AP Photo/Petros Giannakouris)

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London Business School's Michael Jacobides tells CNN's Maggie Lake of the possible contagious effects of Greece's exit from the European Union.

Fears of 'Grexit' contagion

London Business School's Michael Jacobides tells CNN's Maggie Lake of the possible contagious effects of Greece's exit from the European Union.