A new study has found that people who use money from a joint bank account are less likely to make purchases for pleasure.

That’s because they feel the need to justify the expense to their partners, according to researchers at the University of Notre Dame.

That leads couples who pool their finances to favor utilitarian purchases that are easier to justify, the researchers note.

“We found that this spending pattern was not a one-time occurrence,” said Dr. Emily Garbinsky, an assistant professor of marketing at the University of Notre Dame in Indiana. “People made these decisions over and over, which resulted in thousands of dollars spent.”

In one experiment, researchers asked study participants who were in romantic relationships if they had access to both separate and joint bank accounts with their partners. If they did, the researcher asked them to remove one of the bank account cards from their wallets or purses and then use the card to purchase one of two items on the table: A coffee mug or a beer mug. The results showed that people who used their joint credit cards were more likely to opt for the utilitarian coffee mug than the hedonic beer mug.

To test whether the need to justify was in fact influencing purchase decisions, the researchers conducted another study with people in romantic relationships who had access to both joint and separate bank accounts.

The participants were randomly assigned to use one of these two accounts, and then asked to imagine that they were shopping for new clothes. They had found two promising options. One option included clothes for fun, social occasions, and the second included clothes for work. Both options cost $75, and they were on a budget and could only choose one.

After making their choices, the participants indicated the extent to which they felt the need to justify the purchase decision to their partners on a scale from one to seven. The study’s findings suggest that people who used the joint account were more likely to purchase work clothes, and they experienced a greater need to justify their spending to their partners.

To further test their hypothesis, the researchers studied bank account data over a 12-month period for people in romantic relationships.

They discovered that individuals who used a joint bank account spent significantly less on hedonic purchases, such as eating out, alcohol, and vacations, and more on utilitarian products, such as gas, insurance and electricity, than those spending from a separate bank account.

The findings suggest that pooling finances may be a simple way to spend money more responsibly, Garbinsky said.

“Intuitively, people tend to think that there are advantages to keeping money separate because it allows freedom to spend money without feeling guilty, but we are living in an era when 50 percent of Americans are living paycheck to paycheck,” she said.

But she adds that couples with joint bank accounts should not let the need to justify spending go too far.

“Hedonic purchases are associated with happiness, so there could be negative consequences if couples are never spending money on hedonic purchases,” she concluded.

The study was published in the Journal of Consumer Psychology.

Source: Society for Consumer Psychology