The Battle of the Bond Benchmarks

Some prominent institutional bond investors are shifting their focus from traditional benchmark indices, which weight countries’ debt issues by market capitalization, toward GDP-weighted indices. But there is a risk that some investors could lose sight of the purposes of a benchmark index.

TOKYO – Some prominent institutional bond investors are shifting their focus from traditional benchmark indices, which weight countries’ debt issues by market capitalization, toward GDP-weighted indices. PIMCO, one of the world’s largest fixed-income investment firms, and the Government Pension Fund of Norway, one of the largest sovereign wealth funds, have both recently made moves in this direction. But there is a risk that some investors could lose sight of the purposes of a benchmark index.

The benchmark exists to represent the views of the median investor. For many investors – both those who recognize their relative lack of sophistication and those who don’t – going with the benchmark is a good guideline. This is an implication of the efficient markets hypothesis (EMH), for example.

To be sure, EMH theorists are often too quick to discount the possibility of beating the benchmark: It should not have been so hard to figure out during the 2003-2007 credit-fed boom that countries with high foreign-denominated debt, particularly in Europe, were not paying a sufficiently high return to compensate for risk. Or, to take another (harder) call, some of these same countries’ deeply discounted bonds, after heavy markdowns, would have been good buys in early 2012.

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