This issue contains two symposia, one on defense innovation and one on the economics of conflict, with a focus on theory and micro-level evidence. In the first, Renaud Bellais studies defense innovation and venture capital, Sylvain Daffix and Yves Jacquin consider European defense R&D within a national innovation systems framework, and Peter Hall and Andrew James consider the structure of defense innovation and industry in the U.K. In the second symposium, guest edited with an introduction by Philip Verwimp, Mansoob Murshed considers social contracts, greed, and grievance, Zulfan Tadjoeddin and Anis Chowdhury consider violence in Indonesia, Ana Maria Ibanez, looks at forced displacement in Colombia, and Steven Spittaels and Filip Hilgert use conflict mapping to analyze the situation in the DR Congo. In addition, in four stand-alone articles, Christopher Warburton considers war and exchange rate valuation, Steve Chan reviews the democratic peace thesis, Steve Townsend writes on petropolitics, and Ronan Bar-El, Kobi Kagan, and Asher Tishler examine issues of long and short term military planning.