With stock market volatility teetering, it is important to look at the factors going into the market. Further, it is important to review the historic market crashes and corrections we have had. Doing so allows us to have insight into the unpredictability of the market--insight that allows us to prepare and protect retirement assets. This week, Dave Hall analyzes the past, present, and future of the stock market, what it means for your retirement, and how you can protect your retirement from the next market crash.