QUOTE : First agriculture, and then industry, changed two fundamental things about the human experience. The accumulation of personal property allowed people to make more and more individualistic choices about their lives, and those choices unavoidably diminished group efforts toward a common good. And as society modernized, people found themselves able to live independently from any communal group. A person living in a modern city or a suburb can, for the first time in history, go through an entire day—or an entire life—mostly encountering complete strangers. They can be surrounded by others and yet feel deeply, dangerously alone. The evidence that this is hard on us is overwhelming. Although happiness is notoriously subjective and difficult to measure, mental illness is not. Numerous cross-cultural studies have shown that modern society—despite its nearly miraculous advances in medicine, science, and technology—is afflicted with some of the highest rates of depression, schizophrenia, poor health, anxiety, and chronic loneliness in human history. As affluence and urbanization rise in a society, rates of depression and suicide tend to go up rather than down. Rather than buffering people from clinical depression, increased wealth in a society seems to foster it.