I'm glad you found the image useful. No need for any attribution, the graph is in the public domain. Somebody should produce a better version with more accurate

I'm glad you found the image useful. No need for any attribution, the graph is in the public domain. Somebody should produce a better version with more accurate proportions based on the Swiss data, possibly with a log scale on the vertical axis to accommodate all income brackets. Then we can really start asking questions about whether that kind of curve is attainable and/or "affordable". By the way, one of the replies on Twitter says the curve on the right should be linear. Nope. The fact that the curve on the right still has a noticeable slope is the only thing that keeps Friedman, Hayek, and all your favorite (left|right)-libertarians on board the scheme.