c.这个经济中的牺牲率是多少?请解释。 d.这些方程式对通货膨胀与失业之间的短期和长期取舍关系意味着什么? Suppose that an economy has the Phillips curve π=π-1-0.5(u-un), and that the natural rate of unemployment is given by an average of the past two years'unemployment: un=0.5(u-1+u-2...