“Two centuries ago, oil was less than worthless. It was a blight that people would pay to have removed from their land. However, suppose one day a mysterious stranger appeared claiming to be a time-traveler. He told everyone that one day oil would be the world’s most valuable fuel. It would called ‘black gold’. Wars would be fought over it and enormous machines would be built to collect every last drop. Though no one knew if the purported time traveler was telling the truth or how to develop the technologies that would one day make oil valuable, some entrepreneurs believed him and began to collect oil to prepare for the day that it became black gold.”
formerly http://coinconsultancy.com/2013/07/18/the-original-value-of-bitcoins/