When Stock Prices Fall, Antidepressant Prescriptions Rise

Feeling depressed when the stock market is down? You have plenty of company. According to a recent study, when stock prices fall, the number of antidepressant prescriptions rises.

The researchers examined the connection by first creating local stock indexes, combining companies with headquarters in the same state. Academic research has shown that investors tend to own more local stocks in their portfolios, either because of employee-stock-ownership plans or because they have more familiarity with those companies.

The researchers then looked at about 300 metropolitan statistical areas, which are regions encompassing a city with 50,000 people and the surrounding towns, tracking changes in local stock prices and the number of antidepressant prescriptions in each area over a two-year period. They found that when local stock prices dropped about 12.8% over a two-week period, antidepressant prescriptions increased 0.42% on average. A similar relationship was seen in smaller stock-price drops as well. When local stock prices fell by about 6.4%, antidepressant prescriptions increased about 0.21%.

Older and sadder

“Our findings suggest that as the stock market declines, more people experience stress and anxiety, leading to an increase in prescriptions for antidepressants,” says Chang Liu , an assistant professor at Ball State University’s Miller College of Business in Muncie, Ind., and one of the paper’s co-authors. The analysis controlled for other factors that could influence antidepressant usage, like unemployment rates or the season.

In a comparison of age groups, those aged 46 to 55 were the most likely to get antidepressant prescriptions when local stocks dropped.

“People in this age group may be more sensitive to changes in their portfolio compared with a younger cohort, who are further from retirement, and older cohorts who may own less stocks and more bonds since they are nearing retirement,” says Maoyong Fan , a professor at Ball State University and co-author of the study.

Other correlations

When the authors looked at demand for psychotherapy during periods of declining stock prices their findings were similar. When local stock prices dropped by about 12.8% over a two-week period, the number of psychotherapy visits billed to insurance providers increased by about 0.32%. They also found a correlation between local stock returns and certain illnesses associated with depression, such as insomnia, peptic ulcer, abdominal pain, substance abuse and myocardial infarction. But when the authors looked at other insurance claims, like antibiotics prescriptions, they found no relationship with changes in local stock prices.

By contrast, for periods when stocks rise, the authors didn’t see a drop in psychological interventions. They found no statistical relationship between rising local stock prices and the number of antidepressant prescriptions, for example, which the authors believe makes sense.

“Once a patient is prescribed an antidepressant, it’s unlikely that a psychiatrist would stop antidepressant prescriptions immediately,” says Liu.

One practical implication of the study, Liu adds, is that investors should be aware of their emotional state when the market dips before they make investment decisions.