What conditions produce a willingness to sacrifice our own self-interest for others? McGrath and Gerber find that collaboration increases willingness to sacrifice, distinct from considerations of accountability, in-group favouritism or disparity.

Although controversial for some, the Joint Comprehensive Plan of Action — also known as the Iran deal — offered a legal arrangement to curb Iran’s nuclear activities and limit its ability to build weapons. This Review examines the deal’s technical basis and how it could be applied in other contexts.