This is the fifth collection of articles by Eliyahu Ashtor to be published by Variorum and focuses on the fundamental question of why, during the later Middle Ages, technology and industry declined, even collapsed, in the Muslim Levant, while simultaneously making enormous progress in the Christian West. An indefatigable researcher in archives all over the Mediterranean, Ashtor amassed quantities of data on this subject, and began to propose causal links between, on the one hand, demographic trends, types of political regime, economic policies and attitudes towards innovation, and on the...