The Case for Common Currency: Guernsey Market House Facts is an important book on economics and finance written by renowned author Joseph Theodore Harris. In this work, the author examines the unique case of the introduction of a common currency on the island of Guernsey and its impact on the economy and society. The book describes in detail the history of the creation and functioning of the Guernsey Market Chamber, reveals the basic principles of the common currency and its benefits for the local community. Through the analysis of the specific example of Guernsey, the author attempts to show the possibility of successful integration of the common currency into the modern financial system. The book is of interest to readers interested in alternative forms of money, economic experiments, and social innovation. "The Case for a Common Currency: Facts about the Guernsey Market House" will be a useful source of information for anyone interested in the economic theory and practice of currency systems.