The world’s wealthiest are prospering. As of February 2017, there were about 2,000 billionaires in the world. This micro-elite controls over US$7.6 trillion, an increase of 18 percent from 2016.

A billionaire’s spending power is difficult to grasp, both because most people do not correctly intuit large numbers, and because a billion dollars far outstrips most people’s experience.

What does a household budget look like to a billionaire? To find out, let’s scale down a billionaire’s income to $50,000, the median American income, adjusting budget items proportionally.

A year in the life of Joe Billionaire

To start, we need to estimate a billionaire’s annual income.

In the 30 years from 1987 to 2016, Bill and Melinda Gates amassed about $120 billion. This figure represents $80 billion in net worth and $40 billion controlled by their charitable foundation. The Gates’ average annual income for these years is $120 billion divided by 30, or $4 billion. (The Bill and Melinda Gates Foundation is a strategic partner of The Conversation US and provides funding for The Conversation internationally.)