What does "bond price elasticity" mean? How does the price elasticity of bonds compare to the yield to maturity of zero-coupon bonds? Why? Which means that zero-coupon Treasury bonds are more volatile...

What does "bond price elasticity" mean? How does the price elasticity of bonds compare to the yield to maturity of zero-coupon bonds? Why? Which means that zero-coupon Treasury bonds are more volatile than high-coupon Treasury bonds in terms of market value.