“In a low-interest rate world, Puerto Rico’s bonds have offered investors juicy yields over the past several years. Puerto Rico’s $3.5 billion in general-obligation bonds issued in 2014 initially had a yield of 8.7%. The yield on 10-year U.S. Treasury notes, by contrast, hovered between 2% and 3% last year. But now investors are getting a fast lesson on the risk that comes with those sorts of high yields. More than half of all U.S. municipal-bond funds, or 298 of 565, have invested in Puerto Rico’s debt, according to the most recent fund holdings compiled by Morningstar.”
http://blogs.wsj.com/moneybeat/2015/06/30/puerto-ricos-crisis-deals-a-blow-to-municipal-bond-funds/