少寫了幾個字，可能有誤解。

Geometric average equals arithmetic average only if  the return rate is zero throughout the entire period (or the account value holds constant).  For all other scenarios, geometric average necessarily is lower than arithmetic average.   

所有跟帖： 

• only if the return rate is CONSTANT.... -slow_quick- ♂ (78 bytes) () 12/31/2023 postreply 18:20:17

• 幾何平均是10%，算術平均是10.5% -BullishSolar- ♂ (0 bytes) () 12/31/2023 postreply 18:23:24

• 您別生氣哈，這兩個回報率怎麽算其實主帖裏都有。。。 -slow_quick- ♂ (45 bytes) () 12/31/2023 postreply 19:25:28

• 仔細看了看，才知道“平均年回報率“是什麽意思。 -BullishSolar- ♂ (0 bytes) () 12/31/2023 postreply 19:41:54

• 你是對的，是我一邊想return, 一邊想principal (value). 結果混起來了。 -Francine- ♀ (0 bytes) () 12/31/2023 postreply 18:29:51

• 還一邊看PACKERS VS VIKINGS. -Francine- ♀ (0 bytes) () 12/31/2023 postreply 18:34:27

• 哈哈，這才是人生 -slow_quick- ♂ (0 bytes) () 12/31/2023 postreply 19:15:35