This stands in stark contrast to many modern societies, where the suicide rate is as high as 25 cases per 100,000 people. (In the United States, white middle-aged men currently have the highest rate at nearly 30 suicides per 100,000.) According to a global survey by the World Health Organization, people in wealthy countries suffer depression at as much as eight times the rate they do in poor countries, and people in countries with large income disparities—like the United States—run a much higher lifelong risk of developing severe mood disorders. A 2006 study comparing depression rates in Nigeria to depression rates in North America found that across the board, women in rural areas were less likely to get depressed than their urban counterparts. And urban North American women—the most affluent demographic of the study—were the most likely to experience depression.
The mechanism seems simple: poor people are forced to share their time and resources more than wealthy people are, and as a result they live in closer communities. Inter-reliant poverty comes with its own stresses—and certainly isn’t the American ideal—but it’s much closer to our evolutionary heritage than affluence. A wealthy person who has never had to rely on help and resources from his community is leading a privileged life that falls way outside more than a million years of human experience. Financial independence can lead to isolation, and isolation can put people at a greatly increased risk of depression and suicide. This might be a fair trade for a generally wealthier society—but a trade it is.
The psychological effect of placing such importance on affluence can be seen in microcosm in the legal profession. In 2015, the George Washington Law Review surveyed more than 6,000 lawyers and found that conventional success in the legal profession—such as high billable hours or making partner at a law firm—had zero correlation with levels of happiness and well-being reported by the lawyers themselves. In fact, public defenders, who have far lower status than corporate lawyers, seem to lead significantly happier lives. The findings are in keeping with something called self-determination theory, which holds that human beings need three basic things in order to be content: they need to feel competent at what they do; they need to feel authentic in their lives; and they need to feel connected to others. These values are considered “intrinsic” to human happiness and far outweigh “extrinsic” values such as beauty, money, and status.
Bluntly put, modern society seems to emphasize extrinsic values over intrinsic ones, and as a result, mental health issues refuse to decline with growing wealth. The more assimilated a person is into American society, the more likely they are to develop depression during the course of their lifetime, regardless of what ethnicity they are. Mexicans born in the United States are wealthier than Mexicans born in Mexico but far more likely to suffer from depression. Like corporate lawyers, they may have a harder time achieving the three pillars of self-determination—autonomy, competence, and community—and wind up with a higher rate of depression. By contrast, Amish society has an exceedingly low rate of depression because, it is theorized, many Amish remain utterly unassimilated into modern society—to the extent that they won’t even drive cars.
“The economic and marketing forces of modern society have engineered an environment… that maximize[s] consumption at the long-term cost of well-being,” a study in the Journal of Affective Disorders concluded in 2012. “In effect, humans have dragged a body with a long hominid history into an overfed, malnourished, sedentary, sunlight-deficient, sleep-deprived, competitive, inequitable, and socially-isolating environment with dire consequences.”
The alienating effects of wealth and modernity on the human experience start virtually at birth and never let up. Infants in hunter-gatherer societies are carried by their mothers as much as 90 percent of the time, which roughly corresponds to carrying rates among other primates. One can get an idea of how important this kind of touch is to primates from an infamous experiment conducted in the 1950s by a primatologist and psychologist named Harry Harlow. Baby rhesus monkeys were separated from their mothers and presented with the choice of two kinds of surrogates: a cuddly mother made out of terry cloth or an uninviting mother made out of wire mesh. The wire mesh mother, however, had a nipple that dispensed warm milk. The babies took their nourishment as quickly as possible and then rushed back to cling to the terry cloth mother, which had enough softness to provide the illusion of affection. Clearly, touch and closeness are vital to the health of baby primates—including humans.