[A] Introduction: The book - 'The Psychology of Money' has a wonderful message - wealth creation is a function of both - luck and risk. One needs to be 'reasonable' to manage the risk. One should not be over rational, neither should one be too casual with their investments. It is more of an error and trial (semi scientific and semi artistic) process, where one keeps on learning with experience and try to increase the risk adjusted returns, while keeping a margin of safety. None of us is rational and emotions are all around and in us. No one can run away from them. The same emotions, pre occupations and beliefs also affect our investment decisions. In this article, we will try and explore the biases that do not allow us to take 'reasonable' decisions related to investment. [B] What is a bias?: According to dictionary.com, " a strong feeling of favour towards or against one group of people, or on one side in an argument, often not based on fair judgement o