The Tired Consumer

Decision fatigue has had a bad decade in the laboratory and a good one at the till. The theory that willpower drains like a battery has struggled in large replications. Yet retailers, streaming services and fund houses keep building as though the battery were real, and shoppers keep rewarding them. Both things can hold only if the popular explanation is wrong and the observed behaviour is right. That is where this series starts: with a consumer who looks tired and may in fact be doing careful arithmetic.

The Consumer Signal reads behaviour before it turns into a trend deck. Each issue closes its evidence with a Signal Card: one behaviour, one grade (Noise, Faint, Forming or Established), who pays for it, and what would make us drop it.

The question

If the science of depletion is shaky, why do so many markets act as if people have run out of capacity to choose?

Three observations

1. [Reporting] The laboratory case has weakened. A preregistered replication across 23 labs, published in 2016, found an ego-depletion effect close to zero. A larger multi-site effort published in 2021 did little to rescue it. Choice overload has a similar record. A 2010 meta-analysis put the average effect near zero. A 2015 meta-analysis found that overload does appear under specific conditions: complex sets, hard trade-offs, unclear preferences, and a shopper who wants to minimise effort. Those conditions matter more than the slogan.
2. [Reporting] Commercial designers work to a short clock anyway. In a 2015 paper, two Netflix executives wrote that a member tends to lose interest after perhaps 60 to 90 seconds of choosing, having looked at 10 to 20 titles. Costco runs on roughly 4,000 items, where a large supermarket often carries tens of thousands. In India, monthly contributions through systematic investment plans passed ₹25,000 crore in late 2024. Each of these sells the same thing in a different category: one decision instead of many.
3. [Analysis] The better model is rationing. Christopher Sims's work on rational inattention treats attention as a scarce input that people allocate, with a known cost for processing information. Apply that to ordinary life. The number of small decisions has risen: consent banners, tip screens, plan tiers, delivery slots, notification settings. The value of each has stayed low. A person who refuses to deliberate over them has not failed. They are keeping a budget. "Fatigue" describes how this feels from the inside. Budgeting describes what it does to a market.

The overlooked signal

The usual reading of a tired shopper is that they pick the cheapest option, or the first one. We think the more important behaviour is quieter. They decide once, then stop deciding. They reorder from the last basket. They accept the preset plan. They leave the standing instruction in place.

The evidence for how strong this is comes from defaults. Madrian and Shea's 2001 study of 401(k) plans showed automatic enrolment reshaping participation. A 2019 meta-analysis found default effects to be substantial, though highly variable by setting. What has changed is the reach. A default used to be something employers and governments set. Now any app can set one, and shoppers increasingly welcome it in categories they regard as chores.

That moves the contest. If a category is decided once, then the fight for preference is concentrated in a few rare moments when the old decision gets reopened: a move, a new job, a child, a bad experience. Alan Andreasen wrote about life changes and brand switching in 1984. The idea is old. The share of spending that now waits for such a moment may be growing.

The Signal Card
Signal	Decide-once behaviour: reorders, standing plans, accepted defaults
Grade	Forming
Who pays	Challengers, who must wait for a reopening moment; and incumbents, if a default ever betrays the shopper
Drop it if	Repeat and auto-replenish shares stop rising in categories that shoppers describe as chores

The contrarian reading

Shoppers have always done this. Herbert Simon described satisficing in 1955, and no one needed a consent banner to invent habit. Perhaps we are dressing an old fact in new clothes because "tired" flatters an anxious age.

There is also a counterexample in plain sight. Shein is reported to add thousands of new items a day, and people scroll through them for pleasure. The same person who accepts a default energy tariff may spend an evening reading about a chef's knife. So the market is not uniformly tired. It splits. Some decisions are chores, where any added choice is a cost. Others are hobbies, where choice is the product. "Decision fatigue" as a market condition is only true of the first group, and the line between the two differs by person and by country.

Commercial implications

• Sort your category before you design for it. The practical question is whether customers see the decision as a chore or a hobby. A brand that asks for deliberation in a chore category is charging a price the shopper did not agree to. A brand that strips choice from a hobby category removes the fun.
• Plan media around reopening moments. If decisions are made once and left alone, steady persuasion in between may be doing less than the reach charts suggest. The challenger's budget belongs near the events that reopen the question.
• Treat a default as borrowed trust. The shopper has stopped checking. That is valuable, and it is a loan. A quiet price rise inside a standing plan draws on the account, and one discovered betrayal can reopen every decision the customer had closed.

Forecast

[Forecast] By 2030, at least two major grocery apps in the US, the UK or India will open on a pre-filled basket, rather than a search box, as the default screen for returning customers.

Confidence: 55%.

Your turn

Which decision in your category do customers treat as a chore, and what would you lose if you admitted it?