Journal: Behavioural Public Policy

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Cambridge University Press

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2018 - 201912020 - 20252
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Publications 1 - 3 of 3
  • Nudging folks towards stronger password choices: Providing certainty is the key
    Item type: Journal Article
    Renaud, Karen; Zimmermann, Verena (2018)
    Behavioural Public Policy
    Persuading people to choose strong passwords is challenging. One way to influence password strength, as and when people are making the choice, is to tweak the choice architecture to encourage stronger choice. A variety of choice architecture manipulations (i.e. ‘nudges’) have been trialled by researchers with a view to strengthening the overall password profile. None has made much of a difference so far. Here, we report on our design of an influential behavioural intervention tailored to the password choice context: a hybrid nudge that significantly prompted stronger passwords. We carried out three longitudinal studies to analyse the efficacy of a range of ‘nudges’ by manipulating the password choice architecture of an actual university web application. The first and second studies tested the efficacy of several simple visual framing ‘nudges’. Password strength did not budge. The third study tested expiration dates directly linked to password strength. This manipulation delivered a positive result: significantly longer and stronger passwords. Our main conclusion was that the final successful nudge provided participants with absolute certainty as to the benefit of a stronger password and that it was this certainty that made the difference.
  • The effects of policy design complexity on public support for climate policy
    Item type: Journal Article
    Fesenfeld, Lukas Paul (2025)
    Behavioural Public Policy
    Important challenges like climate change require transformative policy responses. According to a growing public policy literature, such transformative responses typically require complex policy packages that bundle various individual policy instruments to complement each other, compensate transition losers, and create positive synergies. Nevertheless, while adding new instruments to a package can increase policy effectiveness, it comes at a price: increased policy design complexity. Increased complexity potentially leads to fundamental public misperceptions that undermine policy legitimacy and feasibility. Here, I argue that complex policy packages affect public opinion through a compensation, policy perception, and design complexity mechanism. To test this argument, this study assesses if citizens evaluate proposals for isolated climate policies related to food and mobility behaviors differently to complex policy packages. Employing a novel two-stage conjoint-experimental approach with 9115 respondents from the USA and Germany, the study shows that policy packaging increases citizens’ perceived policy effectiveness to reduce climate pollutants, but also perceived restrictions on citizens’ lifestyles. Moreover, increased design complexity can lead citizens to pay special attention to salient costly parts of policy packages. However, increased design complexity does not fundamentally reverse preferences. Through packaging desired and undesired policy instruments, policymakers can increase public support for transformative climate policies.
  • Dark patterns and consumer vulnerability
    Item type: Journal Article
    Zac, Amit; Huang, Yu-Chun; von Moltke, Amédée; et al. (2025)
    Behavioural Public Policy
    Dark patterns that manipulate consumer behaviour are now a pervasive feature of digital markets. Depending on the choice architecture utilised, they can affect the perception, behaviour and purchasing patterns of online consumers. Using a novel empirical design, we find strong evidence that individuals across all groups are susceptible to dark patterns, and only weak evidence that user susceptibility is materially affected by commonly used general proxies for consumer vulnerability (such as income, educational attainment or age). Our conclusions provide empirical support for broad restrictions on the use of dark patterns, such as those contained in the EU's Digital Services Act, that protect all consumer groups. Our study also finds that added friction, in the form of required payment action following successful deployment of dark patterns, reduces their effectiveness. This insight highlights the instances in which dark patterns would be most effective - when no further action is required by the user. Consumer vulnerability is therefore more pronounced when dealing with online providers who store users' payment details and can rely on a 'single click' to complete the purchase.
Publications 1 - 3 of 3