Written following years of scholarly research, this study presents the essence of the Church's doctrine regarding one of the most pervasive economic ills of our day, usurious lending. Cutting through the complex maze of modern economics and finance, Professor McCall explains in a scholarly yet accessible manner the core principles of the usury doctrine. Tracing its history from Biblical texts, through Aristotelian philosophy and Roman law, to the great scholastic synthesis Professor McCall separates the unchanging principles from the changes in their applications to new economic realities. With debt, personal, business and government spiraling out of control and massive insolvencies of ancient nations like Greece, contemporary economic theory has offered little in response. Professor McCall contributes the wisdom of the centuries in a concise and readable study.