There are so many investment-impacting behavioral biases, we could probably identify at least one for nearly every letter in the alphabet. We continue with the most significant ones by looking at Hindsight, Loss Aversion, Mental Accounting and Outcome Bias.
Hindsight bias is the "I knew it all along" effect – the belief that our memory is correct when it is not. For example, say you expected a candidate to lose, but she ended up winning. When asked afterward how strongly you predicted the actual outcome, you're likely to recall giving it higher odds than you originally did. This is a very common bias.