It would hold tax receipts to their post-World War II average of between 18% to 19% as a share of the economy.

WSJ: Review & Outlook: Paul Ryan and His Critics

On the secretary are bills and Post-it notepads and loose receipts and whatnot.

NEWYORKER: Playdate

And tax receipts were 19.2% of GDP. (Tax receipts were higher at a 50% top rate than any time during the post-WWII era of 80% and 90% tax rates.) The top rate was cut to 38.5% in 1987 then 28% in 1988, and tax receipts were 18.4% and 18.2% of GDP.

FORBES: Tax Rates and the Great Fairness Debate