In 500 years from now, what will the wealthiest person on the planet be an expert on?
Depends on which planet you are referring to. In 500 years time I would suspect interstellar space flight will be a reality and the universe will become a much smaller place due to it. The discoveries and technical advancement we will have made will be awesome and unbelievable. Look how far with technology we have come in the last 20 years. So I would suggest the richest person in the universe would be the overseer in interplanetary travel……….