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.