Ah Ju: this is exactly what I want to know. Thank you so much!!!! I have 2 questions: 1. now stock is almost all time high, do you suggest to wait, or don't time the market? 2. a portfolio can reduce risk if assets are negatively correlated. Bond and stocks used to be negatively correlated, but not so much now these days (cuz of QE?). in that case, is constructing a portfolio with stock and bond hoping to risk volatility still work?