...A recent study by... found that over 20 years the Joint Committee on Taxation] has always underestimated the revenues from tax hikes, while overestimating the revenues that are lost when taxes are cut.... The Joint Tax calculations of the "cost" of death tax repeal have been particularly wild and inexplicable. In 2001, JCT famously estimated that repeal would cost the Treasury $600 billion over 10 years -- twice as much as the death tax actually raises. The Joint Tax whiz kids built into their computer models the behavioral effects of lawyers working the interplay between the death and gift tax...