The importance of time and compound interest in investing cannot be overstated. Over long time horizons steady saving and investing using index funds such as Vanguard with low expenses can take advantage of compound interest to generate good returns. This happens for a strategy of dollar-cost averaging into broad indexes over longer horizons. The longer horizons help overcome fluctuations and volatility, even bubble behaviours, as compound interest plays a larger role. Investing based on timing is not viable because no one is prescient about the market. It is risky if this route of timing is taken because the investor ends up staying out of the market for long periods thus missing out on the power of compound interest to generate good returns. One way of looking at this is to take a $100 investment and see what happens by the sixth year on a calculator if it is invested at 10%, in the sixth year it generates 16% on the original $100.