slope=real interest rate slope=target rate of return
所以real interest rate和target rate of return都是以slope来计算的 (因为Y-axis标的是Labor productivity不是interest rate or rate of return) 而point 2的slope比point 1和point 3的slope都要大所以 At point 2,the real interest rate exceeds the target rate of return这句话是没问题的。