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Inciting instead of coercing, 'nudges' prove their effectiveness

January 17, 2022
Université de Genève
To get through challenges such as the pandemic or the climate change, citizens must change their habits and behaviors. But how can this be achieved without resorting to coercive measures? The answer to this question may be the 'nudges' that have been gaining popularity over the last decade. By making small changes in our environment, these interventions aim to encourage changes in our behavior, while preserving our freedom of choice. From adding informative labels to reorganizing the food offer in a cafeteria, the overall effectiveness of these interventions has now been demonstrated.

Developed by the American economist Richard Thaler in the late 2000s, the theory behind "nudging" theory is based on the principle that our choices are not only determined by our ability to reason, but are also influenced by certain biases such as our emotions, our memories, the opinions of others or the configuration of our environment. Focusing on these elements can therefore be more effective in getting us to change certain behaviours than a ban or an awareness-raising campaign.

In the behavioral sciences, researchers call this a modification of the "choice architecture." This is done, for example, when in a company cafeteria the healthiest dishes are deliberately placed at the top of the menu to encourage customers to select the option that is most beneficial to their health, without infringing on their freedom to choose. As a result, this type of intervention is attracting increasing interest from both the scientific community and public authorities.

Over 450 strategies analyzed

Despite the growing popularity of nudges, their performances had not yet been studied in their entirety. By performing a meta-analysis (a statistical approach aimed at synthesizing the results of numerous studies), a research team from the University of Geneva (UNIGE) has succeeded in demonstrating the effectiveness of "nudges" and identifying the areas in which they are most relevant. "We have collected more than 200 scientific articles published over the last 15 years on the subject, which represent more than 450 'nudge' strategies," says Stéphanie Mertens, the study's first author and a researcher at the Consumer Decision and Sustainable Behavior Laboratory of the Department of Psychology in the Faculty of Psychology and Educational Sciences at the UNIGE.

To carry out this study, the researchers classified the nudges described in this scientific literature into three groups: "information," "structure" and "assistance." In the first set, they grouped interventions whose objective is to inform individuals in order to motivate them to make certain choices, such as the "nutri-score" labels found on certain food products. In the second set, they grouped techniques that deal with the structure of an environment. This is the example (cited above) of highlighting certain meals in a cafeteria menu.

In the third set, they classified nudges involving a form of commitment, as in the case of a person who stops smoking and informs those around him or her. When informed, the people around him or her take on the function of a "safeguard" in the choice architecture of the abstinent smoker.

Highly effective for food choices

The scientific team concluded that all three groups of nudges are effective. They note, however, that the techniques in the second group ("structure") are the most effective. "Within these groups, we also compared different areas of application, such as health, finances or energy consumption. In the end, we found that nudges work best in the area of food," explains Tobias Brosch, Director of the Consumer Decision and Sustainable Behavior Laboratory. Tobias Brosch and his team have also observed disparities in the quality of the studies produced on the subject over the years. "It is imperative that the overall study quality increases because of the impact that nudges can have on the daily lives of citizens," he explains.

All of the synthesized data is now available to researchers. But this study is also intended to become a reference document for policymakers who wish to implement these new practices. "However, it is important to bear in mind that nudges are powerful tools, as our research shows. Nudges must therefore be used wisely and within the framework of democratic and transparent processes," concludes the researcher.

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Materials provided by Université de Genève. Note: Content may be edited for style and length.

Journal Reference:

  1. Stephanie Mertens, Mario Herberz, Ulf J. J. Hahnel, Tobias Brosch. The effectiveness of nudging: A meta-analysis of choice architecture interventions across behavioral domains. Proceedings of the National Academy of Sciences, 2022; 119 (1): e2107346118 DOI: 10.1073/pnas.2107346118

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Université de Genève. "Inciting instead of coercing, 'nudges' prove their effectiveness." ScienceDaily. ScienceDaily, 17 January 2022. <>.
Université de Genève. (2022, January 17). Inciting instead of coercing, 'nudges' prove their effectiveness. ScienceDaily. Retrieved May 28, 2024 from
Université de Genève. "Inciting instead of coercing, 'nudges' prove their effectiveness." ScienceDaily. (accessed May 28, 2024).

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