Everyone has biases..... even denying that you have any bias is a bias! Wiki has a list of a couple of hundred. Here are some of the most common.... So next time you make an investment decision - maybe just do a quick check to see which of these biases you're guilty of. Of course it applies equally to the simpler things in life..... so before you next post something on PC, have a think about which ones you've succumbed to.