Little Return Better Than None for Corporate-Bond Buyers: Chart

Bonds of blue-chip American companies are the beneficiaries in a world gripped in uncertainty. The extra premium investors demand to hold corporate debt compared with safer government bonds has fallen to the lowest level in a year. Events like the U.K. vote to exit the European Union, along with stubborn weakness in commodities, have prompted central banks to keep interest rates low -- many even going negative -- leading investors to seek higher-yielding assets.

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