Discusses the Laffer Curve, which is a curve that charts the revenue received at different tax rates
The curve necessarily has a hump – the government will not receive any revenues at 100% taxation nor will they receive revenue at 0% taxation. Economists agree on this, but they disagree on where exactly the hump is.
Christina Romer and her husband found the hump is around 33%. Romer is a liberal economist under President Obama.
Unfortunately, I can’t fact check this due to the length of the paper (59 pages), but it seems like some claims are overstated. I’ve linked the paper below as well as a NYTimes article written by the author.