通常係大牛市build up mispricing,再泡沫爆破之後再價值股發威。Value spread 同 earnings growth 係預測未來value factor returns 嘅兩大因素(value soar spread越大,earnings growth越慢,value factor expected return 就越大)
你話有冇得 time, 我諗係有研究呢啲 factors點樣隨住macroeconomic 變化,但呢啲嘢我唔熟

,等其他人補充。我見過嘅做法都係睇value spread同埋earnings growth去 time