Changing federal income tax rates, or the income bases to which those rates apply, can affect federal tax revenues partly by altering people’s behavior, and thus their actual or reported incomes.
To the extent that a given tax change might affect revenues partly by affecting national-income growth, existing research provides enough guidance to generate informative bounds on the size of any growth-driven revenue effect.
For large proposed changes in tax rates or the tax base, official revenue forecasts provided to Congress would probably be more accurate if the CBO and JCT tried to estimate fully how the proposed tax changes would affect growth-driven revenue.
Most college professors who assign textbooks would not be able to guess, within 10% of the actual figure, the retail price that their students pay for new copies of those books.
Since students can resell college textbooks or rent electronic versions, the net burden on students is substantially lower than retail prices for new textbook purchases would suggest.
