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Commentary: Shoppers don't mind shrinkflation if they think there's a discount

Lower prices, even when the goods are at a smaller size, are more favourable to consumers than price increases or package downsizing alone, say researchers.

SYDNEY: Have you noticed that your favourite chocolate is a little smaller, there are fewer biscuits in the same-sized package or that your bags of chips contain more air? If you haven’t, you’re not alone.

What marketers call a “contents reduction strategy” is more popularly known as “shrinkflation” reducing the size of a product while the price remains the same.

It’s a comparatively recent phenomenon in the supermarket business, reflecting the pressure on manufacturers to keep prices down. In fact, the word “shrinkflation” entered the lexicon only in 2009.

Since then, manufacturers have “shrunk” everything from jars of Vegemite, Maltesers, Tim Tams, Freddo Frogs and Corn Flakes. In the United Kingdom, the Office for National Statistics counted 2,529 examples between 2012 and 2017.

So why does shrinkflation seem preferable when it is effectively the same as putting up the price?

To investigate this, we conducted experiments playing with consumer perceptions of changes in prices and volume sizes. Our results show the innate cognitive bias that shoppers have towards focusing on price, no matter what.


In our experiments, we wanted to measure the relative effectiveness of different strategies to increase a product’s per-unit price.

We simulated this in real-world conditions by manipulating shoppers’ perceptions of products for sale in a supermarket in Brisbane and then measured the differences in sales. The experiment took six weeks and involved five products coconut rolls, confectionery, biscuits, soy milk and coconut water.

We changed neither the price nor the size of these products. But we did change the shelf tickets, to manipulate shoppers into believing the price or size had previously been different.

Each week over four weeks, we changed the shelf tickets to test the following four scenarios, all implying an identical increase in the per-unit price. 

Tactic 1 created the impression that only the price had increased. Tactic 2 created the impression that the price was the same but the size had been reduced (standard shrinkflation).

Tactic 3 created the impression that the size has increased, but also the price had increased even more. Tactic 4 created the impression that the product’s price had been reduced, but also the size had been reduced even more (shrinkflation variant).

A woman selects fruits at a supermarket where consumer prices are surging. (AP Photo/Frank Augstein)

The product and price never changed but the signs indicating the previous price and size did. In each case, the “before” per-unit price was also shown an identical 38 cents per 10 grams.

The other two weeks were used as control weeks. In one week, we displayed a “New Package” shelf ticket. In the other control week, we displayed a regular shelf ticket without the words “New Package”.

Even though the changes signalled by the shelf tickets represented an identical increase in per unit price, the sale results suggest that shoppers found our shrinkflation variant the most attractive.

With tactic 4 (our shrinkflation variant) 530 units were sold. This compares with 448 sales with tactic 3, 435 sales for tactic 2 (standard shrinkflation) and 391 sales for tactic 1.


These results demonstrate the commercial power of psychological framing.

First, there is the “silver lining effect” a mixed outcome consisting of a small gain (a lower price) and a larger loss (an even smaller size) is more favourable than a net outcome consisting of just a smaller loss (price increasing or package downsizing) alone.

This effect is tied to the loss aversion theory developed by psychologists Daniel Kahneman and Amos Tversky, which says people value losses and gains differently.

Second, price is more noticeable and is given more weight than size. Thus shoppers were influenced more by the price drop than by the reduction in package size. We attribute this to an automatic cognitive response people have an inherent preference for lower prices.

In most developed countries, consumer protection laws require retailers to display unit prices to enable shoppers to cut through the proliferation of marketing signals designed to attract attention. However, there’s no obligation to show the “before” unit price, so it’s difficult to gauge unit price changes.

It seems to be equally important for retailers to advertise unit price changes to help consumers make more informed purchases.

But our results confirm what marketers have clearly gleaned over the past decade. Consumers’ cognitive biases are strong. So you can expect ever more shrinkflation and ever more “price drop”, “discount”, “new price” and “price match” tickets to adorn supermarket shelves.

Jun Yao and Di Wang are Senior Lecturers in Marketing at Macquarie University and the Queensland University of Technology respectively. Gary Mortimer is a Professor of Marketing and Consumer Behaviour at the Queensland University of Technology. This commentary first appeared in The Conversation.

Source: CNA/geh


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