If the idea that you might see a significant fraction of your portfolio's value vanish due to falling share prices is the sort of thing that can keep you up at night, you're not alone. For some people, the key to peaceful sleep is as simple as keeping a highly diversified portfolio, which minimizes the risk that any single declining stock or sector can pose to your overall holdings. Pfizer (NYSE: PFE) is a low-risk investment because it makes so many medications that millions of people worldwide need.
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