It seems to me that this comprises two necessarily related elements. One is higher corporate taxes: he wants to "strip out some of the huge tax reliefs and subsidies on offer to the corporate sector" - which he claims to be £93bn a year. This would depress investment, by depriving firms of some of the means and motive to invest. However, this would be offset by "people's quantitative easing" - a money-financed fiscal expansion: