答案最后一句话是什么意思，为什么是用短期9%的利率来算re

NO.PZ201512300100000305 问题如下 5. Common stoissues in the above market with average systematic risk are most likely to have requirerates of return: A.between 2 percent an7 percent. B.between 7 an9 percent. C.9 percent or greater. C is correct.Baseon a long-term government bonyielof 7 percent, a beta of 1, anany of the risk premium estimates thccalculaterom the givens (e.g., a 2 percent historicrisk premium estimate or 4.3 percent supply si equity risk premium estimate), the requirerate ofreturn woulleast 9 percent. Baseon using a short-term rate of 9 percent, C is the correchoice. the short-en yiel are 9 percent an10-yematurities, yiel are 7 percent.The geometric mereturn relative to 10-yegovernment bonreturns over 10years is 2 percent per year.这两句话是不是前后矛盾啊？还是说我理解错了

NO.PZ201512300100000305问题如下5. Common stoissues in the above market with average systematic risk are most likely to have requirerates of return:A.between 2 percent an7 percent.B.between 7 an9 percent.C.9 percent or greater.C is correct.Baseon a long-term government bonyielof 7 percent, a beta of 1, anany of the risk premium estimates thccalculaterom the givens (e.g., a 2 percent historicrisk premium estimate or 4.3 percent supply si equity risk premium estimate), the requirerate ofreturn woulleast 9 percent. Baseon using a short-term rate of 9 percent, C is the correchoice.beta=1怎么从题干看出来

NO.PZ201512300100000305 这题是不是4.3（上一小问题）*1+7%=11。3>9%

NO.PZ201512300100000305 between 7 an9 percent. 9 percent or greater. C is correct. Baseon a long-term government bonyielof 7 percent, a beta of 1, anany of the risk premium estimates thccalculaterom the givens (e.g., a 2 percent historicrisk premium estimate or 4.3 percent supply si equity risk premium estimate), the requirerate ofreturn woulleast 9 percent. Baseon using a short-term rate of 9 percent, C is the correchoice.老师你好，不知道这道题题干中画红线的句子是什么意思？是如何得知ERP为2%的？以及β为1题目原文中也没有提及好像。