Since the beginning of her existence on this earth the Church of Jesus Christ has taught about both faith and morals, that is, about what we are to believe and how we should behave. Under the latter head the Church has taught much about the virtue of justice and has applied that teaching to many specific situations in human affairs. Many of these situations are complex, but that has not prevented the Church from making moral judgments about the rights and the wrongs that are involved. Since the latter half of the nineteenth century the Church has addressed the modern economy of Capitalism, and rendered judgments on many aspects of that economy. The body of these teachings is generally known as Catholic Social Teaching, and it began in an authoritative way with Leo XIII’s 1891 encyclical Rerum Novarum. Since then nearly every pope has added to the corpus of the Church’s social teaching through encyclicals or other documents, as did the Second Vatican Council in its constitution Gaudium et Spes.