India, Dec. 9 -- Be fearful when others are greedy, and be greedy when others are fearful." This statement by the famous investor Warren Buffett puts in a nutshell the concept of contrarian investing. It is an approach that has benefited many successful investors like Buffett himself and billionaires like Peter Lynch and John Templeton, to name a few. Contrarian investing is an approach that follows rational behaviour when the popular sentiment on the bourses is irrational. Contrarian investors go against the prevalent market sentiment and invest in stocks and sectors that have vast growth potential in the long run but are currently undervalued due to a short-term negative sentiment. The stock market is made up of traders and investors. Tra...