My TIAA-Cref retirement portfolio is very diversified and I adjust it about every 6 months. I have only lost about 15% the past 18 months (knock on wood, many times).
I thought the idea is that if you have at least 10 years until retirement, it was "best" to sit tight on stock investments (to a certain degree). I was told that at low values, you are accumulating more quantity of stocks and when the market rebounds, you will make out better.
Is this simplistic thinking wrong, assuming the market does bounce back, as historically it has?