We think that lower corporate taxes do increase investment and so would increase profits, and we also think that countries with lower corporate tax rates would be more attractive places for multinational groups to locate their profits. But we don't have any evidence to suggest that those changes would completely finance the tax cut. We would expect that a cut in the corporate tax rate would normally involve a reduction in revenue.
What has happened in a lot of OECD countries is that they have accompanied cuts in the rate by broadening the base, removing various sorts of special exceptions and perhaps reducing the generosity of depreciation allowances, and that's how they've managed to maintain revenues while cutting corporate rates.