饼饼王 · 2020年02月16日
问题如下：
As the number of stocks in a portfolio increases, the portfolio's systematic risk:
选项：
A.can increase or decrease.
B.decreases at a decreasing rate.
C.decreases at an increasing rate.
解释：
A is correct.
When the number of the sotcks in a portfolio increases, unsystematic risk will decrease at a decreasing rate. However, the portfolio's systematic risk will be decreased by adding lower-beta stocks or increased by adding higher-beta stocks.
这题说的不是系统性风险吗 是不变的啊
NO.PZ2015121802000034问题如下the number of stocks in a portfolio increases, the portfolio's systematic risk:A.cincrease or crease.B.creases a creasing rate.C.creases increasing rate.A is correct.When the number of the sotcks in a portfolio increases, unsystematic risk will crease a creasing rate. However, the portfolio's systematic risk will creaseaing lower-beta stocks or increaseaing higher-beta stocks.如果题干问的是总体风险，是不是升降也不一定？要看各股票直接的相关系数，对么？
NO.PZ2015121802000034 问题如下 the number of stocks in a portfolio increases, the portfolio's systematic risk: A.cincrease or crease. B.creases a creasing rate. C.creases increasing rate. A is correct.When the number of the sotcks in a portfolio increases, unsystematic risk will crease a creasing rate. However, the portfolio's systematic risk will creaseaing lower-beta stocks or increaseaing higher-beta stocks. 老师好，讲义里有这么一个图形，所以我记忆的是系统性风险维持不变。
答案的最后一句有没有对应的公式啊？
题目是做对了，但是请问B和C分别是什么意思啊？
