Here’s a thought. How rich are billionaires? Think of it this way. Many people think $100,000 is a substantial sum—plenty to live on for a year, unless you’re in a very overpriced city or have high career expectations. If you have saved a cool $1 million, that pays your living expenses for 10 years. Unless you invest wisely, it probably wouldn’t last a younger person the rest of his life. But if you have $1 billion, it pays living expenses for 10,000 years. I mean, if you gave yourself an insane sum of $1 million per year to live on, your billion would enable you to live that way for 1,000 years. So, yeah. It’s a lot of money. And if you were as rich as Elon Musk, you could pay living expenses for 436,000 years. Or “only” 43,600 years if you spent “only” a million per year.