Book excerpt: The “migration-displacement nexus” is a new concept intended to capture the complex and dynamic interactions between voluntary and forced migration, both internally and internationally. Besides elaborating a new concept, this volume has three main purposes: the first is to focus empirical attention on previously understudied topics, such as internal trafficking and the displacement of foreign nationals, using case studies including Afghanistan and Iraq; the second is to highlight new challenges, including urban displacement and the effects of climate change; and the third is to explore gaps in current policy responses and elaborate alternatives for the future.