This supplement issue focusing on Economic Insecurity combines papers emphasizing measurement of trends and cross-national comparisons of economic insecurity with papers discussing its policy determinants and social implications. In general, economic insecurity is about the looming economic dangers that affect people's lives in many spheres, from the fear of losing one's job to the anxiety of not being able to make ends meet. As Stiglitz et al. (2009) have argued, measuring economic insecurity is fundamental to understanding people's economic wellbeing and to giving economic policy a wider perspective than that provided by static measures of poverty and material deprivation. Measuring it in the right way helps us not only to understand how people are objectively exposed to the risk of poverty and material hardship, but also to understand how their behaviors and feelings are possibly affected by such risks and the dynamics of poverty and material deprivation. As such, it provides an important tool to policy makers to better assess the causal pathways into and out from poverty and deprivation and to better identify the policy actions needed.In recognition of the importance of this topic, the Organization for Economic Cooperation and Development and the International Association of Income and Wealth organized a conference on its measurement, causes, and policy implications. Presenters were invited to submit papers to the Review, and this Supplement Issue contains those that were accepted after the peer review process.The hazards of economic life differ depending on the age, gender, and socioeconomic background of individuals, and depending also on the institutional features, generosity, and effectiveness of national welfare systems; hence economic insecurity also differs along these dimensions-and for many people, the spill-over impacts on well-being include health, social networks, and subjective well-being. This variety of impacts implies that there is as yet no unique agreed framework for defining and measuring economic insecurity. However, underpinning most existing approaches is the idea of uncertainty about future economic losses and the extent to which this uncertainty harms people's well-being. Stiglitz et al. (2009)