關於本益比疑問 - 股票

By Hardy
at 2021-04-17T20:46
at 2021-04-17T20:46
Table of Contents
小弟是韭菜,不是學商科,
本益比問題求教高人
假如某公司股票,
去年每股淨值是S0
今年的每股淨值是S1
E0是去年的EPS,
E1是今年的EPS
假設每年的ROE都維持差不多
則因為,
S0x(1+ROE)= S1 ……(1)
S0×ROE = E0 …… (2)
S1xROE = E1 ……(3)
=> 由(1)(3)
E1/E0 = 1 + ROE
所以 ROE 除了是淨值成長率
(或叫股東權益報酬率),
同時也是EPS 成長率 ?
現在台積電的ROE是22.5左右
而本益比是30左右
以現在的股價P買進,
原本應該是要30年左右回收,
但是因為EPS會成長
E0+E1+E2+E3+…+En= P=30xE0
上面是等比級數,公比是1+ROE
E0x(1-r^n)/(1-r) = 30xE0
則 n 大概在10~11之間
所以若台積電ROE 幾年間,大概都維持不變,以目前的股價和EPS 關係
實際上只要10年左右就可回收(因為EPS會成長),所以實際本益比是10倍多 ?
這樣對嗎 ?
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