Why the same price feels smaller when it is stated per day

What Gourville's 1998 paper tested

John T. Gourville published "Pennies-a-Day: The Effect of Temporal Reframing on Transaction Evaluation" in the Journal of Consumer Research in March 1998 (volume 24, issue 4, pages 395–408). He was the sole author.

The paper studies marketers who recast a one-time cost as a series of small, ongoing expenses. In many cases the buyer still pays in a single lump. The total does not change, and neither does the payment.

Gourville named the tactic the "pennies-a-day" strategy. His laboratory studies covered several product categories. They supported both the strategy's effectiveness and the model he proposed to explain it.

The mechanism: a different comparison

The paper proposes a two-step process. First, the buyer retrieves a standard to compare the price against. Second, the buyer evaluates the transaction against that standard.

A per-day frame leads people to recall small, recurring expenses as the standard. An aggregate frame leads them to recall large, infrequent ones.

According to the abstract, this difference in what people retrieve significantly affected how they evaluated the transaction and whether they complied.

Nothing about the product has changed. What changed is which memory the price is held up against.

What later experiments added

Stephen Atlas of the University of Rhode Island and Daniel Bartels of Chicago Booth studied the idea in "Periodic Pricing and Perceived Contract Benefits", a Journal of Consumer Research paper that Chicago Booth Review described as forthcoming in a May 3, 2018 article by Alice G. Walton. Their finding goes beyond cost. Framing a price in small daily amounts also made people believe they were getting more for their money.

In the charity test, participants were more willing to give at $1 a day than at $350 a year, and they expected to enjoy giving more. MBA students showed more interest in newspaper and streaming-music subscriptions when the cost was stated per day. Those who chose the daily option reported being happier with their purchase.

In a luxury car lease, participants were more willing to lease at $20 a day than at $7,250 a year. Over a year, $20 a day comes to about $7,300, so the daily price was the higher of the two by roughly $50. The $1-a-day donation comes to $365 against $350, a difference of $15.

The one test with real customers ran with a meal-delivery company. Its ads priced the service at either $16 a day or $99 a month. First-time subscribers bought 77% more meals when the price was framed as a daily expense.

Where the evidence is thinner

The Booth Review article says MBA students who chose periodic pricing were happier with their purchases, even when the lump sum was sometimes the better deal. The effect concerns how the price feels. It does not show that the buyer saved money.

Most of the results come from stated likelihoods. The charity, subscription and car-lease findings are what participants said they would do. Only the meal-delivery test measured behaviour with real ads.

One subscription test used MBA students. The authors conclude that marketers can encourage purchase with periodic pricing, even for significant sums "under the right conditions". Those conditions are not spelled out, so the size of the effect in any other business is unsettled.

None of the research described here tests whether a per-day price changes cancellations, refund requests or complaints once the full amount is billed. The studies measure the decision to buy. What happens afterwards is a separate question.

Nothing about the product has changed. What changed is which memory the price is held up against.

Why billing frequency affects use and renewal

Gourville's later work on the timing of payments bears on the same question. In a September 30, 2002 Harvard Business School Working Knowledge interview with Manda Mahoney, he argued that these terms, including when and how a price is charged, might have a dramatic effect on the optimal price.

His starting point is the sunk-cost effect. Economists regard attention to sunk costs as irrational, but he said nearly everyone factors them in. One example was a tennis club member who kept playing through pain after paying $300 to join.

The effect weakens the further a buyer is from the initial payment. Gourville described many clubs that collect a full year's fee at the start. Members attend heavily in the first month or two, then drop off as the payment fades from memory. He said churn at health clubs can exceed 50 percent.

Members who pay monthly keep the cost in view. In his account they are more likely to work out regularly and to renew, because encouraging early consumption raises the odds of renewal.

He also described research with Dilip Soman finding that people use products more when the price feels out of pocket and vivid. Single-game ticket buyers attend more than package buyers, because the cost of each game is salient to them.

For a business, a per-day price shown on a page and a billing schedule are separate choices. The first shapes the decision to buy. The second shapes how much customers use the product and whether they renew.

What this changes for subscription pricing

Gourville's own guidance depends on retention. A manager who doubts customers will stay year to year may reasonably bill in full at purchase, because it reduces administrative hassle and maximises revenue. A manager who hopes for repeat purchases should encourage consumption in the current period, and instalment billing is one way to do that.

He added that price-optimisation software handles the level of a price well when other terms are held constant. It cannot easily capture behavioural effects of changing the terms, such as moving from annual to monthly payments. He noted that car buyers react more to the size of a monthly payment than to loan length: a rise from $300 to $350 a month may draw a bigger negative reaction than stretching a loan from 36 to 48 months.

For a subscription, the research suggests that a per-day figure lowers the comparison standard. The Booth Review article also notes that the lump sum was sometimes the better deal. In the car-lease test the daily price was the higher one, and participants were still more likely to say they would lease the car.

The test closest to real conditions is the one the meal-delivery study used: real ads, real signups and the same offer stated two ways. Stated intent alone is the weakest form of the evidence.