Any study that points out Greece as an example where workers are better off should immediate warrant suspicion.
Where does it say Greece is an example where workers are better off?
The only mention of Greece is as one of two states where the a higher percentage of workers earn less than half of the median wage than in the US:
In the United States, nearly 15 percent of workers earn less than half of the median wage. That gives the U.S. a higher "low-income rate" than any other developed nation besides Greece and Spain.