Explores economic reasoning in the analysis of conflict and security. Public goods, trade-offs, game theoretic models of conflict and collective action in defense. Models of war, peace, and deterrence. Arms races, proliferation, and control regimes. Trade interdependence, sanctions, and coercion. Economic theory of alliances and burden sharing. Defense industry structure and procurement incentives. Political economy of budgeting and the military-industrial complex. Application of public choice theory to defense institutions. Focus on theory-informed evaluation of real-world security challenges.