Holding out for a lower price on a purchase can make good sense... even when you're buying a stock. After all, why pay more when you don't have to?

Just because a stock's taken a tumble, however, doesn't necessarily mean it's worth buying on that dip. Sometimes a stock's down for good reason, and perhaps more declines are in store.

Consider, for example, the Nasdaq's worst-performing stocks of October. They might merit consideration as investments at their now lower prices. Or, they might be train wrecks.

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Source Fool.com