Niskanen recently analyzed data from 1981 to 2005 and found his hunch strongly confirmed. When he performed a statistical regression that controlled for unemployment (which independently influences spending and taxes), he found, he says, “no sign that deficits have ever acted as a constraint on spending.” To the contrary: judging by the last twenty-five years (plenty of time for a fair test), a tax cut of 1 percent of the GDP increases the rate of spending growth by about 0.15 percent of the GDP a year. A comparable tax hike reduces spending growth by the same amount.
Again looking at 1981 to 2005, Niskanen then asked at what level taxes neither increase nor decrease spending. The answer: about 19 percent of the GDP. In other words, taxation above that level shrinks government, and taxation below it makes government grow. Thanks to the Bush tax cuts, revenues have been well below 19 percent since 2002 (17.8 percent last year). Perhaps not surprisingly, government spending has risen under Bush.
http://opinionator.blogs.nytimes.com/20 ... -is-nixon/