A second group put their main emphasis on tax cuts rather than spending cuts or debt reduction. Many embrace supply-side economics, arguing that as high taxes discourage economic activity and investment, tax cuts would result in economic growth leading in turn to higher government revenues. According to them, these additional government revenues would reduce the debt in the long term. They also argue for reducing taxes even if it were to lead to short term increases in the deficit. Some supply-siders have advocated that the increases in revenue through tax cuts make drastic cuts in spending unnecessary. However, the Congressional Budget Office has consistently reported that income tax cuts increase deficits and debt and do not pay for themselves. For example, the CBO estimated that the Bush tax cuts added about $1.5 trillion to deficits and debt from 2002 to 2011 and it would have added nearly $3 trillion to deficits and debt over the 2010–2019 decade if fully extended at all income levels.