Author, economist, and theologian Mary Hirschfeld of Villanova University talks about her book, Aquinas and the Market, with EconTalk host Russ Roberts. Hirschfeld looks at the nature of our economic activity as buyers and sellers and whether our pursuit of economic growth and material well-being comes at a cost. She encourages a skeptical stance about the ability of more stuff to produce true happiness and/or satisfaction. The conversation includes a critique of economic theory and the aspect of human satisfaction outside the domain of economists.