Consumers are far more likely to splurge windfall money than expected

Payday is not the only moment when customers spend more. Any time consumers receive a windfall, like birthdays or bonuses, they will increase their spending. Three Ohio University psychologists, Hal Arkes, Cynthia Joyner and Mark Prezzo, ran an experiment in 1994 exploring this phenomenon. When they recruited students for the experiment half were told a week before that they would be paid $3, while the rest expected to be given course credits. However, when the participants arrived at the experiment they were all given the same $3 incentive.

The participants were given the chance to gamble with their cash on a simple dice game. Those who had been given cash in the windfall condition gambled on average $2.16 while those who had been fully expecting the money only frittered away $1.

Unexpected money arrives unemployed. The nearest temptation offers it a job. Expected income already has obligations waiting: rent, food, savings, the direct debit for a service nobody remembers choosing. A windfall slips past the queue. Because it was absent from the plan, spending it can feel as though nothing has been lost.

The students gambled more when the same $3 arrived unexpectedly. The money’s arithmetic stayed still. Its biography changed.

Tax refunds, surprise bonuses and returned travel credit carry similar permission. Gift cards intensify it by restricting value to one shop, where the reasonable choices become “spend” or “eventually forget”. Put £20 on a general balance and it competes with every future use. Print one retailer’s name on it and the same £20 starts suggesting a £60 purchase.

Enjoying a windfall can be entirely sensible. Pleasure is a legitimate use of money, despite what certain budgeting apps imply. The problem begins when the label silently approves risks, fees or purchases that ordinary income would reject.

A rule chosen before the surprise is less excitable: wait a day; reserve a share for enjoyment; treat the rest as normal money. Even renaming it “mine” can restore the comparison with everything else it could do. For sellers, the insight explains a moment of higher willingness to spend. It does not make predation tasteful.

The surprise bonus arrives on Friday. By Monday it can be savings, dinner, debt repayment or all three. Without a prior decision, the first persuasive checkout gets to choose.