Jun 25, 2021 01:05 PM EDT
How you spend your money can signal aspects of your personality, according to research published in Psychological Science, a journal of the Association for Psychological Science. Analyses of over 2 million spending records from more than 2,000 individuals indicate that when people spend money in certain categories, this can be used to infer certain personality traits, such as how materialistic they are or how much self-control they tend to have.
"Now that most people spend their money electronically - with billions of payment cards in circulation worldwide - we can study these spending patterns at scale like never before," says Joe Gladstone of University College London, who co-led the research. "Our findings demonstrate for the first time that it is possible to predict people's personality from their spending."
We all spend money on essential goods, such as food and housing, to fulfill basic needs - but we also spend money in ways that reflect aspects of who we are as individuals. Gladstone and colleagues wondered whether the variety in people's spending habits might correlate with other individual differences.
"We expected that these rich patterns of differences in peoples spending could allow us to infer what kind of person they were," says Sandra Matz, who co-led the project.
In collaboration with a UK-based money management app, Gladstone and Columbia Business School researchers Sandra Matz and Alain Lemaire received consent and collected data from more than 2,000 account holders, resulting in a total of 2 million spending records from credit cards and bank transactions.
Account holders also completed a brief personality survey that included questions measuring materialism, self-control, and the "Big Five" personality traits of openness to experience, conscientiousness, extraversion, agreeableness, and neuroticism.
Participants' spending data was organized into broad categories -- including supermarkets, furniture stores, insurance policies, online retail stores, and coffee shops - and the researchers used a machine-learning technique to analyze whether participants' relative spending across categories was predictive of specific traits.
Overall, the correlations between the model predictions and participants' personality trait scores were modest. However, predictive accuracy varied considerably across different traits, with predictions that were more accurate for the narrow traits (materialism and self-control) than for the broader traits (the Big Five).
Looking at specific correlations between spending categories and traits, the researchers found that people who were more open to experience tended to spend more on flights, those who were more extraverted tended to make more dining and drinking purchases, those who were more agreeable donated more to charity, those who were more conscientious put more money into savings, and those who were more materialistic spent more on jewelry and less on donations.
The researchers also found that those who reported greater self-control spent less on bank charges and those who rated higher on neuroticism spent less on mortgage payments.
"It didn't matter whether a person was old or young, or whether they had a high or low salary, our predictions were broadly consistent," says Matz. "The one exception is that people who lived in highly deprived areas were more difficult to predict. One possible explanation may be that deprived areas offer fewer opportunities to spend money in a way that reflects psychological preferences."
Viewed in the context of previous research that has attempted to use online behavior to predict personality, these results suggest that spending-based predictions of personality are less accurate than predictions based on Facebook "likes" or status updates, which offer a more direct reflection of individual preferences and identity. However, spending-based predictions seem to be just as accurate as predictions based on individuals' music preferences and Flickr photos.
The findings have clear applications in the banking and financial services industries, which also raises potential ethical challenges. For example, financial services firms could use personality predictions to identify individuals with certain traits, such as low self-control, and then target those individuals across a variety of domains, from online advertising to direct mail.
"This means that as personality predictions become more accurate and ubiquitous, and as behavior is recorded digitally at an increasing scale, there is an urgent need for policymakers to ensure that individuals (and societies) are protected against potential abuse of such technologies," Gladstone, Matz, and Lemaire write.
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