Suppose you want to estimate the risk-free rate for country X. Country X has local currency denominated long-term bonds. Unfortunately, it is not easy to get an estimate of the default spread for Country X because Country X has no dollar or euro-denominated bonds, has no CDS contracts traded on it in the CDS markets, and is not rated by any of the major rating agencies. How would you go about estimating the risk-free rate for country X?