How Credit Cards Affect Our Brains
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How Credit Cards Affect Our Brains

Buying with plastic doesn’t just eliminate a barrier to buying. It actively encourages purchases.

By Cheryl Winokur Munk
Tue, May 4, 2021 10:18amGrey Clock 2 min

It’s been known for decades that credit cards encourage spending. But why that happens still isn’t entirely clear. New research offers some fresh insight into the causes—and how consumers might be manipulated in an increasingly cashless society.

Research on credit-card spending has tended toward the explanation that delaying payment removes a barrier to purchases in shoppers’ minds. A study published in February in Scientific Reports found evidence of another kind of trigger. Differences it found in brain activity between shoppers planning to use a credit card and those planning to buy with cash indicate that buying on credit doesn’t just ease shoppers’ inhibitions, it actively encourages purchases, the researchers say.

The upshot: When people are shopping with credit cards and see a product they like, the neural network in the brain that produces a sensation of reward perks up, which seems to create a craving to spend, says Sachin Banker, assistant professor at the University of Utah, who worked on the study as a Ph.D. student at the MIT Sloan School of Management.

“You’re basically feeling more reward when you shop with credit cards,” he says. “We don’t see that with cash. It was actually a very stark difference.”

Researchers used a form of magnetic resonance imaging to measure the brain activity of the study subjects as they participated in a shopping exercise. Each participant was shown a total of 84 everyday products over the course of three sessions and was asked whether they would buy each product at the stated price. Half the products were offered for purchase by credit card and half for purchase with cash. None of the products cost more than $50.

The differences in the shoppers’ brain activity support the hypothesis that after repeated credit-card purchases over time the brain learns to anticipate the rewards of credit-card shopping, according to the report. And that suggests that consumers could be conditioned to spend through the use of various sensory rewards in new payment systems, Dr. Banker says. For instance, with digital payments the use of particular sounds or vibrations on your smartphone when you make certain purchases but not others could, over time, teach your brain to anticipate rewards for buying specific products while you’re shopping.

Dr. Banker adds that further research could be done to see if the study’s theories hold true at higher prices. It also could study consumers who tend to overuse or misuse credit cards, to understand further why they act as they do. This study focused on people who mostly paid on time and used credit cards appropriately. Understanding brain patterns for other types of consumers could help lead to solutions that attempt to pre-empt harmful spending behaviour, Dr. Banker says.

Reprinted by permission of The Wall Street Journal, Copyright 2021 Dow Jones & Company. Inc. All Rights Reserved Worldwide. Original date of publication: May 1, 2021



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U.S. investors’ enthusiasm over Japanese stocks at this time last year turned out to be misplaced, but the market is again on the list of potential ways to diversify. Corporate shake-ups, hints of inflation after years of declining prices, and a trade battle could work in its favor.

Japanese stocks started 2024 off strong, but an unexpected interest-rate increase in August by the Bank of Japan triggered a sharp decline that the market has spent the rest of the year clawing back. Weakness in the yen has cut into returns in dollar terms. The iShares MSCI Japan ETF , which isn’t hedged, barely returned 7% last year, compared with 30% for the WisdomTree Japan Hedged Equity Fund .

The market is relatively cheap, trading at 15 times forward earnings, about where it was a decade ago, and events on the horizon could give it a boost. Masakazu Takeda, who runs the Hennessy Japan fund, expects earnings growth of mid-single digits—2% after inflation and an additional 2% to 3% as companies return more to shareholders through dividends and buybacks.

“We can easily get 10% plus returns if there’s no exogenous risks,” Takeda told Barron’s in December.

The first couple months of the year could be volatile as investors assess potential spoilers, such as whether the new Trump administration limits its tariff battle to China or goes wider, which would hurt Japan’s export-dependent market. The size of the wage increases labor unions secure in spring negotiations is another risk.

But beyond the headlines, fund managers and strategists see potential positive factors. First, 2024 will likely turn out to have been a record year for corporate earnings because some companies have benefited from rising prices and increasing demand, as well as better capital allocation.

In a note to clients, BofA strategist Masashi Akutsu said the market may again focus on a shift in corporate behavior that has begun to take place in recent years. For years, corporate culture has been resistant to change but recent developments—a battle over Seven & i Holdings that pits the founding family and investors against a bid from Canada’s Alimentation Couche-Tard , and Honda and Nissan ’s merger are examples—have been a wake-up call for Japanese companies to pursue overhauls. He expects a pickup in share buybacks as companies begin to think about shareholder returns more.

A record number of companies have also delisted, often through management buyouts, in another indication that corporate behavior is changing in favor of shareholders.

“Japan is attracting a lot of activist interest in a lot of different guises, says Donald Farquharson, head of the Japanese equities team for Baillie Gifford. “While shareholder proposals are usually unsuccessful, they do start in motion a process behind the scenes about the capital structure.”

For years, money-losing businesses were left alone in large corporations, but the recent spate of activism and focus on shareholder returns has pushed companies to jettison such divisions or take measures to improve them.

That isn‘t to say it is going to be an easy year. A more protectionist world could be problematic for sentiment.

But Japan’s approach could become a model for others in this new world. “Japan has spent the last 30 to 40 years investing in business overseas, with the automotive industry, for example, manufacturing a lot of the cars in the geographies it sells in,” Farquharson said. “That’s true of a lot of what Japan is selling overseas.”

Trade volatility that hits Japanese stocks broadly could offer opportunities. Concerns about tariffs could drag down companies such as Tokio Marine Holdings, which gets half its earnings by selling insurance in the U.S., but wouldn’t be affected by duties. Similarly, Shin-Etsu Chemicals , a silicon wafer behemoth that sells critical materials, including to the chip industry, is another potential winner, Takeda says.

If other companies follow the lead of Japanese exporters and set up shop in the markets they sell in, Japanese automation makers like Nidec and Keyence might benefit as a way to control costs in countries where wages are higher, Farquharson says.

And as Japanese workers get real wage growth and settle into living in an economy no longer in a deflationary rut, companies focused on domestic consumers such as Rakuten Group should benefit. The internet company offers retail and travel, both of which should benefit, but also is home to an online banking and investment platform.

Rakuten’s enterprise value—its market capitalization plus debt—is still less than its annual sales, in part because the company had been investing heavily in its mobile network. But that division is about to hit break even, Farquharson says.

A stock that stands to benefit from consumer spending and the waves or tourists the weak yen is attracting is Orix , a conglomerate whose businesses include an international airport serving Osaka. The company’s aircraft-leasing business also benefits from the production snags and supply-chain disruptions at Airbus and Boeing , Takeda says.

An added benefit: Its financial businesses stand to get a boost as the Bank of Japan slowly normalizes interest rates. The stock trades at about nine times earnings and about par for book value, while paying a 4% dividend yield.

Corrections & Amplifications: The past year is expected to turn out to have been a record one for corporate earnings in Japan. An earlier version of this article incorrectly gave the time frame as the 12 months through March. Separately, Masashi Akutsu is a strategist at BofA. An earlier version incorrectly identified his employer as UBS.