... get a billion or die trying! I don't buy the "create big companies to create many jobs" mantra. A one man company creates one job, and leaves one more job available in the market for someone else. That's a contribution in my book.
The job market is hardly a zero-sum game, though. By growing from a startup to a major player in an industry you helped found, you can do a lot more economic good than you would by creating one job and leaving one available in the existing market.