Focusing on the low-income parts of the world and reviewing the different ways we can define poverty, I first argue that what people generally mean by poverty – or, more broadly, by economic well-being – cannot be adequately captured by a single, absolute measure such as income level or a more complex aggregate such as the Human Development Index. Not only do these measures fail to account for the complexity of human material needs, but they also fail to recognize the importance of distributional issues. The failure to incorporate a consideration of distribution in defining poverty (or, more generally, economic well-being) is conceptually problematic, if not simply wrong. This failure also creates serious practical problems for campaigns ag...