> What she meant was that it's impossible to get that rich without doing something bad — without cheating in some way. > But startups are the most common way to become really rich, and if you want to start a successful startup, the key is not exploitation but empathy. There is no doubt that Graham is right in saying there is a formula to becoming a billionaire and that formula involves creating products that help you…
GDP is a measure of the amount of commerce per year, while global wealth is a net accumulation of all the work that has happened in human history. Billionaires obviously get a disproportionate amount of income per year, but it’s far from 20% of all the world’s GDP. To make your math work that would assume they got all the wealth in a single year.
However, getting relatively accurate and meaningful numbers for billionaires income is probably virtually impossible. Hence the comparison to their wealth which is known. I think it's still a valuable and common comparison. See https://stats.areppim.com/stats/stats_rich_26_trend_percentx... or this New York Time article: https://archive.is/KvbQH or this Guardian article: https://www.theguardian.com/inequality/2026/may/15/wealth-br...