"Francesco Caselli is one of the world's leading experts on economic growth. In Technology Differences over Space and Time, he provides a unified treatment of factor-biased technical change, brilliantly synthesizing earlier research and pushing the frontier forward. Among many insights, he shows how a common framework can help us understand both why skilled workers do so well over time and how this is particularly true in rich countries. Highly recommended!"--Charles I. Jones, Stanford Graduate School of Business

"Caselli shatters the view that technology can flow effortlessly across countries. He shows that the technology used in rich countries favors skilled workers, though not equipment and structures, whereas the technology used in developing countries surprisingly favors unskilled workers. Anybody who wants to understand how technology evolves with development--and how it shapes who gains the most from growth--will want to read this book."--Pete Klenow, Stanford University

"This book is obligatory reading for those interested in the state of the art of research on biased technology across countries and over time."--Antonio Ciccone, University of Mannheim