Many new and efficient technologies require "critical metals" to function. These metals are often extracted as by-product of another metal, and their future supply is therefore dependent on mining developments of the host metal. Supply of critical metals can also be constrained because of...

One of the most sustained uses of economic warfare by the United States occurred in Spain during WWII. We provide an overview of this episode based on the secondary literature and new research in the Spanish archives. We focus on three key battles: (1) an oil embargo against Spain in the summer...