We assume that the return of each project can be split into two types: a) the classic monetary benefit (tangible return) and b) increasing common good (intangible return). B can be maximized by deciding that a or parts of a can be allocated to a common fund instead of cashing in. Participants with low income get access to the fund and therefore can increase their personal profit on their invest in a disproportinal way. We consider this re - allocation of income within the group as an indicator for increase of the common good. Our problem is to select a sub - set of the overall pool of projects and present them to the choice makers in order to
maximize the common good.