Altruism with social roots: emerging literature Brañas Garza, Pablo Espinosa, María Paz Giving Social networks Reciprocity Social integration This paper analyzes the emerging literature on the determinants of giving within a social network. We propose two main explanatory variables for previous experimental results on the friendship effect. The first is social integration, which has a positive impact on giving. The second variable is strategic and is based on reciprocity: the possibility of ex-post favors. Econometric analysis shows that both variables play a positive (and significant) role. 2014-04-30T09:46:06Z 2014-04-30T09:46:06Z 2006 report Brañas-Garza, P.; Espinosa, M.P. Altruism with social roots: emerging literature. Universidad de Granada. Departamento de Teoría e Historia Económica (2006). (The Papers;06/05). [http://hdl.handle.net/10481/31488] http://hdl.handle.net/10481/31488 eng The Papers;06/05 http://creativecommons.org/licenses/by-nc-nd/3.0/ open access Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Universidad de Granada. Departamento de Teoría e Historia Económica