I draw the line at around $20m. Why $20m? Some back-of-the-envelope maths: if you got a decent salary, say $250K, for 40 years and made some smart investments

I draw the line at around $20m. Why $20m? Some back-of-the-envelope maths: if you got a decent salary, say $250K, for 40 years and made some smart investments with it, offsetting your tax and living expenses, you'd have $10m. Double that for elbow room and that gives the extreme upper limit of what someone could reasonably get to by just working for a living. You could earn more, sure, but you'd be in the top 0.1% of earners if you did and we can safely exclude you as an extreme outlier. It's also enough money to do pretty much anything you want to do: sail a yacht around the world? sure. Never work again and live in luxury? Obviously. Make a difference to other people's lives in a good way? Achievable. But it's not enough money to upset entire political economies or buy power at the scale we've seen recently. If I had to implement a wealth tax, and I think we should, then that's the cutoff I'd put it at.