ABSTRACT
As our journey through the various forms and dimensions of reciprocity approaches its conclusion, we are left with the task of summarizing the results emerged from previous chapters, including the ones that were just hinted to and the ones concealed by the formulas; finally, we shall illustrate a few concluding applications offering cues for further reflection. However, it should be remembered, especially in undertaking this final task, that any application originating from necessarily abstract models should be read just as an indication and without losing sight of the strong assumptions underpinning the models.1
