This excerpt originally appeared in The New York Times on April 5, 2012.

In 2013, according to Veronique de Rugy of George Mason University, the Ryan budget would be about 5 percent smaller than the Obama budget, and it would grow a percent or two more slowly each year. After 10 years, government would be smaller under Ryan, but, as Daniel Mitchell of the Cato Institute complains, it would still take up a larger share of national output than when Bill Clinton left office.