text: The final reason is if you talk to just one person your decision is going to be bias. When you have not heard from anyone else but that one person you believe them and think they are 100 percent right. They could be right, or they could be terribly wrong, but you don't know because you have no way to tell if they are right or not. If you hear from two or more people you won't be bias because you have multiple people's opinions. That is the final reason why multiple people are better than just one.