The Psychology of Loot Boxes and Children's Sense of Money — How In-Game Purchase Design Works and How to Plan for It

Lead

Consumer protection agencies in multiple countries receive thousands of complaints each year about children running up charges on a parent's credit card without the parent's knowledge. But framing this as a problem of children's ethics misses the point. Understanding the psychological mechanism behind in-game purchase design is the starting point for prevention.

Understanding the mechanism is not the same as excusing the behavior or blurring who is responsible. It is the preparation needed to think clearly about which settings to change and which conversations to have at home.

The Psychological Design of Loot Boxes

The mechanism behind randomized item drops — "gacha" in Japanese game culture, "loot boxes" in Western contexts — is built on the behavioral psychology concept of the variable ratio reinforcement schedule, formalized by Skinner [1]. The principle: behavior is most persistently maintained when the reward arrives after an unpredictable number of responses. It is the same structure as a slot machine. The expectation that this next pull might be the one keeps the behavior going.

Research linking loot boxes to problem gambling has accumulated significantly. Zendle and Cairns (2018), in a large survey study, found a significant positive correlation between loot box spending and problem gambling scores [2]. Drummond and Sauer (2018) argued that loot boxes are psychologically equivalent to gambling [3]. The important caveat is that correlation is not causation: researchers have also raised the possibility of reverse causation — that people with pre-existing problem gambling tendencies may simply spend more on loot boxes as well as on other gambling activities.

King and colleagues (2019), analyzing video game patent documents, showed that design elements intended to drive purchases are deliberately built into games [4]. In several jurisdictions, probability disclosure requirements now mandate that "odds must be published" — but behavioral research suggests that seeing a low probability does not reliably change behavior. That is precisely the nature of variable ratio reinforcement.

Legal Protections: Real and Limited

In many countries, minors have some legal protection for purchases made without parental consent. In Japan, for example, the Civil Code allows a guardian to cancel a transaction entered into by a minor without consent. However, this protection applies narrowly: when a child has used a parent's credit card information, the legal situation becomes more complicated.

Industry self-regulation in Japan sets monthly spending caps for minors at the guidelines level: approximately 2,000 JPY for under-13s and 5,000 JPY for under-18s [5]. But these caps provide limited protection when the child is using a parent's account — the minor-user safeguards effectively do not apply.

Consumer agency data in Japan record 2,000–3,000 complaints per year related to underage in-game purchases [6], and that figure is not declining. "The law covers this" is not a reliable safety net.

Why Digital Money Doesn't Feel Real

Unlike physical cash, digital purchases do not carry an intuitive sense of how much has been spent. The conversion to "500 coins" or "1,000 gems" is itself a design choice that deliberately softens the felt cost. Research on children's financial literacy suggests that understanding the equivalence between digital currency and real money requires both direct experience and explicit explanation — the abstraction does not resolve itself.

Practical Steps for Families

Changing Settings

iOS: Settings → Screen Time → Content & Privacy Restrictions → iTunes & App Store Purchases → set "Always Require" password. After this, a purchase cannot be completed without the child entering the parent's passcode.

Android: Google Play → Family Link → turn on purchase approval.

These settings are often off by default. Checking them before handing a device to a child is the most reliable prevention.

Designing the Family Rule

Technical restrictions alone are not sufficient. Talking with the child about why the rule exists is what makes it function over time. Agreeing in advance that "all in-game purchases require a conversation first" is more workable than an outright ban. Making the first purchase together is especially valuable — it ties an amount of money to a concrete experience.

When a child comes to a parent asking to spend money in a game, that is also a usable moment for a conversation about what money is, what a sense of satisfaction from acquiring something actually consists of, and what the difference is between wanting something and needing it. Dialogue is more effective for developing financial judgment than punishment.

Summary

In-game purchase design is psychologically optimized to generate spending. That a child is affected by these mechanisms is not a character weakness — it is a designed outcome.

What parents can do: set the technical controls, and begin connecting the feel of digital spending to the feel of real money through ordinary conversation. Prevention by design, before a problem arises, is clearly more effective in this domain.

References

1. Ferster CB, Skinner BF. Schedules of Reinforcement. New York: Appleton-Century-Crofts; 1957.
2. Zendle D, Cairns P. Video game loot boxes are linked to problem gambling: results of a large-scale survey. PLOS ONE. 2018;13(11):e0206767. doi:10.1371/journal.pone.0206767. PMID: 30379881
3. Drummond A, Sauer JD. Video game loot-boxes are psychologically akin to gambling. Nat Hum Behav. 2018;2(8):530–532. doi:10.1038/s41562-018-0360-1. PMID: 31209324
4. King DL, Delfabbro PH, Gainsbury SM, Dreier M, Greer N, Billieux J. Unfair play? Video games as exploitative monetized services: an examination of game patents from a consumer protection perspective. Comput Human Behav. 2019;101:131–143. doi:10.1016/j.chb.2019.07.017
5. Mobile & Game Studio Association of Japan and others. Guidelines for Random Item Provision in Social Games (Gacha Guidelines). Tokyo; 2016.
6. Consumer Affairs Agency of Japan. Consumer complaints related to online games. Tokyo: Consumer Affairs Agency; 2023. Available from: https://www.caa.go.jp/