Which one is a better marketing technique for real estate?

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The most effective marketing for any industry is one the uses referrals. Of those two I would suggest the letter campaign. Unless it's a local community magazine that is popular. We have something like that that everyone uses for the new up and coming people and events. There is a section called 'you should get to know'...I always read it. You might even suggest your local newspaper add a section like that. Most people want to network, they just don't know how.