Municipal bonds are often "advance refunded." Bonds that are not yet callable are defeasedby creating a trust that pays the interest up to the call date, and pays the call price. Newdebt, generally at lower interest rates, is issued to fund the trust. Issuing new securitiesto fund payments on...

Build America Bonds (BABs) are a new form of municipal financing introduced in 2009. Investors in BAB municipal bonds receive interest payments that are taxable, but issuers receive a subsidy from the U.S. Treasury. The BAB program has succeeded in lowering the cost of funding for state and...