This final chapter summarises the arguments and evidence presented in the previous nine chapters - it is thus, in the main, a collection of short summaries of those chapters. The chapter finishes off by contending that the notion that we ought to, and often do, reciprocate is one that most people can accept. It is acknowledged once again that there are many possible dark sides to reciprocity, but that it more often than not serves the better angels of our nature, and in the process generates significant group and, by extension, individual benefits. Consequently, it is advised that policies, institutions, organisations and sectors should be designed to encourage and sustain this most fundamental motivator of human behaviour.