The paper uses the case of Flemish investment support to make a quantitative analysis of pillar II support based on micro-economic data from the FADN and the administrative dataset of the investment support fund. A dynamic panel estimation quantifies the effect of support for settingup young farmers, structural investment support and support for investments on farm diversification, animal welfare or environmental investments.. The results show that investment support for farm diversification and structural support increase the total output and the income. Environmental investment support increase costs and decrease the farm income without a significant impact on output. The conclusion for the national debate is that the structural and the diversification investment support is effective while the environmental investment support is too low to cover all additional costs in the short run. The conclusion for the international debate is that, except for the structural investment support, the Flemish investment support is not distortive for international agricultural markets.