Where did the crisis of the Greek economy come from?

A Philadelphia Inquirer article on the economic crisis in Greece quotes Dean George Tsetsekos, who downplays the popular notion that Mediterranean cultures are less disciplined about work because their warm, sunny weather encourages slackerdom. In summarizing the stereotype, Tsetsekos says: "You have sunrise and sunset in such a way that you have plenty of time to go outdoors, to go swimming, to do other things, as opposed to being in a Nordic country, where you have only three days of daylight, and therefore you are confined to a particular activity and you tend to be more productive."