The second volume of the Handbook of Defense Economics addresses defense needs, practices, threats, and policies in the modern era of globalization. This new era concerns the enhanced cross-border flows of all kinds (e.g., capital and labor flows, revolutionary rhetoric, guerrillas, and terrorists) including the spillovers of benefits and costs associated with public goods and transnational externalities (i.e., uncompensated interdependencies affecting two or more nations). These ever-increasing flows mean that military armaments and armies are less able to keep out security threats. Thus,...