In his 1972 Janeway Lectures at Princeton, James Tobin, the 1981 Nobel Prize winner for economics, submitted a proposal for a levy on international currency transactions. The idea was not greeted with enthusiasm, as the 1970s were a period of optimism and confidence in floating exchange rages. Yet, whenever currency crises erupted during the past decades, the proposal for a levy on international currency transactions would once again arise. In the...