In May the government set up the Office for Budget Responsibility, to provide the government with independent forecasts of UK economic growth and public deficits.

BBC: Tax system 'to be simplified to encourage investment'

This certainly does not prove that economic growth is independent of tax rates, but it does suggest that other factors are far more important.

FORBES: Why we Should Raise Taxes on the Rich (Debate Recap)

But we are absolutely confident the kinds of proposals the President will make will be judged by reputable, nonpartisan, independent economic analysts to be pro-growth, pro-job creation.

WHITEHOUSE: Press Briefing