Rev. Robert A. Sirico is president of the Acton Institute, a Michigan-based think tank that works to integrate “Judeo-Christian Truths with Free Market Principles.” In his new book “Defending the Free Market: The Moral Case for a Free Economy,” Sirico argues that capitalism is not only compatible with Christianity, but that even the most derided aspects of the free market — consumerism, international trade and “unfairness” — help create the most moral economic system available.