We live in a competitive world of business.

Everyone is fighting to make their brand known. They use billboards and commercials and social media–all of which are great ideas. But there’s one way to advertise that trumps all the rest.

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The secret to gaining new clients won’t be found in more funding. Instead, Philip Kotler speaks the truth when he explains that “The best advertising is done by satisfied customers.”

When clients are served well, cared for well, and treated well, they’re satisfied. And satisfied people don’t keep quiet! They tell their friends, their co-workers, and everyone else. They want to share with others just how great this business was to them.

So do good work and build relationships with your clients. They’ll do the rest.