Not only is Greek and UK debt insurance justifiably pricey, it is adding to the cost of other sovereign debt insurance. This from a fascinating little paper from the Bank of Japan, released today.

Credit default swaps (CDS) offer a form of insurance to lenders against the risk of defaulting borrowers. The quantity of sovereign CDS has grown rapidly in the past year, increasing by 30.8 per cent year-on-year to February, compared with just 0.6 per cent for corporate CDS.
The chart above shows that Greek CDS prices are driven largely by idiosyncratic —i.e. Greek—factors, such as the fiscal deficit. The Portuguese chart, by contrast, is increasingly driven by “other” factors: these are defined as the “spillover effects of an idiosyncratic shock in other countries”. Here, I suspect, that means Greece. So where a chart has a lot of grey on it, that country is likely driving CDS prices for other sovereign debt, especially those that have a lot of light blue. And the main culprits (see other charts after jump): Greece, Japan and the UK. Read more