The Greek debt is not viable, unless there is a new "haircut" is the message from a study published by DZ bank, which believes the IMF assessments are over-optimistic.

The Greek debt will fluctuate around 160% of GDP, as long as the present interest rates are maintained , is the point the bank's economist Daniel Lenz made to German newspaper "Die Welt." Dr. Lenz added that debt will be at 143% in most optimistic scenario, according to which starting in 2014 creditors will forgo interest payments.