Investors are buying long-term bonds at the current low interest rates because the interest rate on short-term investments is now close to zero. In other words, buyers are getting an additional 2% current yield in exchange for assuming the risk of holding long-term bonds.
投资者正在以当前低利率买入长期债券，因为目前短期投资利率接近于零。换句话说，买家以2%的更高的当前收益率交换持有长期债券的风险。