If you want to start or build a great business, you have to be very deliberate about whom you share it with or let into it. Emotions and behaviors may circulate through social networks in patterns similar to what’s seen in epidemiological models of the flu virus. Every positive person you let into your life increases your chances of being positive by up to 11 percent, estimated a study published in 2010 in the Proceedings of the Royal Society. "Just one sad friend was needed to DOUBLE an individual’s chance of becoming unhappy," Wired summarized about the report. Figuring out whom to avoid and whom to let in won’t always be easy. But with a little practice, you can get really good at staying far away from people who might bring your new business down. Actually, this article is just the Part 1 of 2, but you can access the complete article in our SPECIAL Online Entrepreneur NEWSLETTERS

Here are 10 People (Whether Friends, Employees or Clients) You Should Avoid If You’re Starting A Business:

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