A PhD does not take at least 5 years, I did mine in just under 3 and am now 2 years in to a startup I founded which will take at least 5 years. The final point

A PhD does not take at least 5 years, I did mine in just under 3 and am now 2 years in to a startup I founded which will take at least 5 years. The final point is also very very wrong. PhD's don't change the world, they push the boundary of what we know a tiny tiny bit forward. And it's widely known that a start up is not the most effective way to earn lots of money, investment banking or working your way up the corporate ladder is. The main difference is that a start up is probably more fun and fulfilling.