Usually when faced with this question people will think of investments in monetary terms. However, in our lives, our best investments are probably the ones you cannot measure the way a portfolio manager will measure his performance.
These investments relate to education, culture, job satisfaction, eagerness to learn, and happiness through philosophy, religion, self-improvement, compassion, love, a harmonious family, friendships, readiness to do good deeds etc.
I do know some of the world's richest people. In monetary terms, they all performed very well. In terms of a fulfilling life, I am less sure.
When it comes to money, the best investments were probably the ones I did not make.
Marc Faber is an international investor known for his uncanny predictions of the stock market and futures markets around the world.