Warren Buffett and Charlie Munger, possibly the most successful investors of our time, have regularly emphasized the importance of rational investing or just being “rational” human beings. When Charlie was asked, “What one word accounts for your remarkable success in life?” his response was “rational.”1  Warren Buffett thinks similarly as seen in Berkshire's annual letter where he stated his successor will be a rational, calm and a decisive individual”.2 So What's Rational Investing? Rational is to be sane, reasonable, of sound judgment, and to derive from reason.  As a fresh and ignorant investor, you may, as I did, think [...]