Andrew Bevan is a lecturer at the Institute of Archaeology, University College London. He has active research interests in the social construction of value across widely ranging time periods and cultural contexts, with a particular focus on early societies in the Middle East and Mediterranean. He is author or Stone Vessels and Values in the Bronze Age Mediterranean (Cambridge, 2007). David Wengrow is a lecturer at the Institute of Archaeology, University College London. He has active research interests in the social construction of value across widely ranging time periods and cultural contexts, with a particular focus on early societies in the Middle East and Mediterranean. Wengrow is the author of Prehistories of Commodity Branding in the journal Current Anthropology, from which the papers in this book were developed. He is also author of The Archaeology of Early Egypt: Social Transformations in North-East Africa (Cambridge, 2006).