Washington Post said:
It’s fairly easy to figure out who the wealthiest person in the United States is. Just look at the Forbes 100, and you see it’s Bill Gates, worth $67 billion. Carlos Slim, the Mexican titan, is worth $73 billion, a measly nine percent more. And with a bit of Googling, you could find similar answers for people across history. The famous Roman politician Marcus Crassus was thought to be among the republic’s wealthiest, with a net worth of 200 million sesterces. Fast forward through time, and John D. Rockefeller is said to have had a peak of $1.4 billion in 1937.
Comparing these fortunes across time and geography poses plentiful problems, though. It’s obviously a big challenge to convert sesterces to dollars. But it’s also difficult to compare Rockefeller’s wealth with Gates’ and Gates’ with Slim’s. The essential question is not how much money you have, but what can you buy with it, where you live and when you live. Slim can buy a lot more in his home of Mexico than Gates can in the United States. Not an easy thing to compare.