The authors, listed in alphabetical order, are respectively with the Agricultural Development Economics
Division (ESA) of the Food and Agricultural Organization (FAO), the Ministry of Livestock and Fisheries
Development of Tanzania, and with the Development Research Group (DECRG) of the World Bank.
Corresponding author is Zezza: azezza@worldbank.org). The authors are grateful to Derek Baker, Gero
Carletto, Luc Christiaensen, Ana Paula de la O, Nancy Morgan and Ugo Pica-Ciamarra for comments on
earlier drafts. Exchanges and discussions on data issues with Leigh Anderson, Kathleen Beegle, Kristen
Himelein, Jon Kastelic, Amparo Palacios-Lopez, and Waly Wane were extremely useful in completing this
work. Raka Banerjee has been of tremendous help in putting the final manuscript together. None of these
people, or the institutions the authors are affiliated with, bears any responsibility for the content of the paper
which rests solely with the authors.