计算change target short-term interest rate, 为什么不考虑预期通货膨胀率的变化？
这是真题给的答案：
Roptimal previous = Rneutral + [ 0.5 x (1.4% – 3.5%) + 0.5 x (0.8% – 2.0%)] =Rneutral –1.65%
Roptimal updated = Rneutral + [ 0.5 x (1.3% – 3.5%) + 0.5 x (0.7% – 2.0%)] =Rneutral –1.75%
The change in the target short-term interest rate is:
Change in Roptimal = Roptimal updated – Roptimal previous = –1.75% – (–1.65%) = –0.10%
新的考纲里面，加入了预期通货膨胀率，算的是名义interest rate，那算变化的时候，为什么不加上通膨的变化呢？除了0.5*（预期通膨－target 通膨）外。
