Confirmation Bias

As a general rule, like humans read or listen to opinions that they are the same as ours. This is the reason that people often read articles that share same a political ideology and that like to be surrounded by people who share the same tastes, values and points of view. The problem is that this trend of the human being can affect critical thinking in called confirmation bias. Confirmation bias is the tendency to give greater value to ideas or opinions that confirm the ideas or opinions. In many cases confirmation bias leads to completely ignore contrary to their own ideas, doing that we only have a point of view.
An example of confirmation bias in which investors can fall is to seek views on press, blogs and forums that confirm their investment