Dr. Ajith Kumar V.V
Bank of America Corp., the biggest underwriter of state and local government debt, isn’t worried that municipal-bond yields will turn negative, even if they do in other parts of the U.S. fixed-income markets. Bond yields have been plunging fast, making it seem possible that American investors could actually wind up paying governments to lend them money -- as is already happening in Japan and much of Europe because of the escalating trade war with China, concerns about slowing global growth and stock market volatility. The yield on 10-year Treasuries has dropped to about 1.55%, with those on tax-free debt about a quarter percentage point less.
Source: https://www.bloomberg.com/news/articles/2019-08-16/negative-muni-bond-yields-bank-of-america-says-no-way?srnd=markets-vp