Finance School of Management The Volatility of Interest Rtes a200 s100 100 -200 LuLiLLLll LLLLL 1960 1970 1980 1990 (b) The changes of rate of return on composite long-term investment grade bond uesTc29 Finance School of Management The Volatility of Interest Rtes Changes in basis points (b) The changes of rate of return on composite long-term investment grade bond