The premise being considered today probably doesn't apply to anyone, since investors can buy as many (or as few) stocks as they want (or can afford). But as a hypothetical, limiting yourself to just one pick can serve as a powerful eye-opener to what you value as an investor. It also forces you to weigh all of a company's pros and cons to come up with a buy decision.

When I do this right now, my top all-weather stock ends up being fast-food chain pioneer McDonald's (NYSE: MCD). Here's why.

If you absolutely need massive returns, forget about it. McDonald's doesn't bring that to the table.

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Source Fool.com