I would first of all refer you to the graph on page 2, the top one, that shows the relationship between after-tax profits as a percentage of GDP, so it's a general measure of business profitability and unemployment. What it shows is that the only time unemployment rises is when profits fall, and the only time unemployment falls is when profits increase. That's after-tax profits. The relationship is not as strong on before-tax profits. In fact, as the profit margin increases over about 6.5%, there's almost a one-to-one relationship between the change.
On that basis, you can track the impact of reducing corporate tax rates in terms of an increase in profitability and a reduction in the unemployment rate. So if businesses are growing, they're employing more people. As more people are employed, personal incomes increase, GDP increases, government revenues increase, and that's where the overall economic benefits come from, as that table outlines.