When building out a stock portfolio, it can help to start out by focusing on companies that dominate their respective industries. You can make that search a bit easier by focusing on industries where there are high barriers to entry, as the companies operating there tend to become premium providers that can help an investor maintain their portfolio's margins.

Today we are going to look at four companies that dominate their industries (and also happen to pay reasonable dividends). Most (but not all) of them are real estate investment trusts (REITs) which usually deliver decent yields as well.

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Source Fool.com