So it is more than clear that European creditors of Greece are continuing to demand long-term primary surpluses around 3.5% of GDP. One has to ask: What’s so special about this number? Why can’t it be lowered a bit and give Greece more breathing space?

The answer is quite simple:

2% interest rate x 180% debt to GDP = 3.5% of GDP/year

The 3.5% primary surplus target is the one consistent with maintaining the debt-to-GDP ratio stable when the nominal GDP growth rate is zero. This means that Greece can  withstand shocks to its nominal growth rate (negative real GDP growth or a deflationary shock) and still manage to keep its debt ratio stable. Obviously, as long as it manages to achieve positive nominal growth its debt ratio will decline each year while privatization receipts will lower debt even quicker.

From a slightly different point of view, the 3.5% target provides insurance to European creditors that any short-term failures of the Greek program will not lead to an increase of the debt ratio, only to a flatter decline path. The risk of the Greek program not achieving its ambitious targets is pushed on the back of Greece while its creditors can keep the upside of any positive shocks that will improve debt sustainability.

Yet again one observes that the Greek issue is mostly a political rather than an economic issue. It relates to the question of who provides insurance regarding the program targets. Since European creditors appear unwilling to provide such insurance my feeling is that agreeing on a lower target will prove substantially difficult, especially in the current political climate across Europe.