Ibidem
Greece is assumed to access markets by end-program at an initial rate of 6 percent, reflecting a prolonged absence from markets, weak track record on delivering fiscal surpluses, and a substantial debt overhang. The rate is lower than the average yield during January-May 2016 by around 300 basis points, and is in line with the rates obtained by the country in 2014 when it was able to temporarily issue on the markets. It is consistent with a risk-free rate of 1-1.5 percent in 2018 and a risk premium of 450-500 basis points (broadly consistent with an increase in the premium of four basis points for each 1 percent of GDP in debt above the Maastricht limit).
Regression analysis suggests that staff’s assumption is at the low (optimistic) end of estimates. A variety of empirical specifications regressing sovereign yields on key macroeconomic fundamentals (debt-to-GDP, debt-to-GDP squared, growth, primary balance, inflation, as well as country and time fixed effects) suggests a range of estimates between 6 and 13 percent (Table 1).
As to its evolution over time, the rate is expected to fall/rise by four basis points for every one percentage point decline/increase in debt-to-GDP ratio, in line with the literature (Laubach, 2009, Ardagna, Casseli, Lane, 2004, Engen and Hubbard, 2004), up to a floor of 4.5 percent (consistent with a small long-run risk free premium of 75 basis points).