问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
size越大，risk越大？
NO.PZ2016072602000028问题如下 Tower Bank approaches economic capitand risk aggregation first estimating the stanalone economic capitfor invirisk factors. In a seconstep, the bank aggregates risks baseon the relative amounts of economic capitallocateto these risks, taking into account the correlations between risk factors. Whiof the following variables is not a primary iver of the versification benefit thaccrues from aggregation? The number of risk positions The size of the portfolio The concentration of those risk positions, or their relative weights in a portfolio The correlation between the positions B is correct. A portfolio is generally more versifiewhen it hmany positions, whiare not too large, anwith low correlations. Henanswers a., c., and involve ivers of versification. In contrast, risk measures are homogeneous with the size of the portfolio. ubling all the positions will uble the risk of the portfolio. 如题。risk position是什么意思？
The size of the portfolio The concentration of those risk positions, or their relative weights in a portfolio The correlation between the positions B is correct. A portfolio is generally more versifiewhen it hmany positions, whiare not too large, anwith low correlations. Henanswers a., c., an involve ivers of versification. In contrast, risk measures are homogeneous with the size of the portfolio. ubling all the positions will uble the risk of the portfolio. 没太看懂 此题考察的是什么知识点？
Tower Bank approaches economic capitanrisk aggregation first estimating the stanalone economic capitfor invirisk factors. In a seconstep, the bank aggregates risks baseon the relative amounts of economic capitallocateto these risks, taking into account the correlations between risk factors. Whiof the following variables is not a primary iver of the versification benefit thaccrues from aggregation? The number of risk positions The size of the portfolio The concentration of those risk positions, or their relative weights in a portfolio The correlation between the positions B is correct. A portfolio is generally more versifiewhen it hmany positions, whiare not too large, anwith low correlations. Henanswers a., c., an involve ivers of versification. In contrast, risk measures are homogeneous with the size of the portfolio. ubling all the positions will uble the risk of the portfolio. C中position越集中，不是会导致相关性越高，然后risk越高吗
Tower Bank approaches economic capitanrisk aggregation first estimating the stanalone economic capitfor invirisk factors. In a seconstep, the bank aggregates risks baseon the relative amounts of economic capitallocateto these risks, taking into account the correlations between risk factors. Whiof the following variables is not a primary iver of the versification benefit thaccrues from aggregation? The number of risk positions The size of the portfolio The concentration of those risk positions, or their relative weights in a portfolio The correlation between the positions B is correct. A portfolio is generally more versifiewhen it hmany positions, whiare not too large, anwith low correlations. Henanswers a., c., an involve ivers of versification. In contrast, risk measures are homogeneous with the size of the portfolio. ubling all the positions will uble the risk of the portfolio. 没理解答案的，为什么选B可否再一下，我选B是因为里面没提到风险资产，而只是porfolio的size。
number为什么会是一个可以分散化的变量呢，如果数量多然而又正相关且correlation大，也没有用吧
