Abstract
We investigate the incremental role of emerging market debt and corporate bonds in internationally diversified government bond portfolios. Contrary to earlier results, we find that international diversification among government bonds does not yield significant diversification benefits. This result is obtained using mean–variance spanning and intersection tests, with restrictions for short sales, both for currency unhedged and hedged internationally developed market government bonds. Currency hedged international corporate bonds in turn do offer some diversification benefits, and emerging market debt, in particular, significantly shifts the mean–variance frontier for a developed market investor. Since especially unconstrained mean–variance spanning and intersection tests can indicate significant diversification benefits, but lead to frontier portfolios with extreme weights, we also consider some ex-ante global government bond portfolio strategies. We find that passive global benchmarks such as GDP-weighed government bond portfolios perform quite well within developed countries.
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