Do you agree with this IBD rule? "Practically speaking, the market is in a clear downtrend. In that climate, it's vital that you heed IBD's cardinal rule of investing: Always sell a stock when it falls 7% or 8% from your buy point. No excuses. We can never be certain how far the market will fall. When leading stocks started faltering in early 2000, the market was coming off a decade of gigantic gains. But the correction worsened, evolving into one of the worst bear markets in history. Many investors who failed to cut losses watched their stocks dive 50% or more, wiping out their portfolios. -- Investors Business Daily 11/20/07"