Reducing Nonmarket Risk This Place is Not for the Timid

Reducing Risk with Dollar Cost Averaging

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An investment portfolio can get killed if it is contains an underperforming stock that does not recover. For this reason, combining the benefits of dollar cost averaging strategy with the diversification and reduced risk of an index fund is a prudent approach when choosing an investment.
Source: http://www.investorguide.com/igu-article-967-stock-strategies-dollar-cost-averaging-stock-strategy.html