Nudge theory

The first formulation of the term nudge and associated principles was developed in cybernetics by James Wilk before 1995 and described by Brunel University academic D. J. Stewart as "the art of the nudge" (sometimes referred to as micronudges).[13] It also drew on methodological influences from clinical psychotherapy tracing back to Gregory Bateson, including contributions from Milton Erickson, Watzlawick, Weakland and Fisch, and Bill O'Hanlon.[14] In this variant, the nudge is a microtargeted design geared toward a specific group of people, irrespective of the scale of intended intervention.

In 2008, Richard Thaler and Cass Sunstein's book Nudge: Improving Decisions About Health, Wealth, and Happiness brought nudge theory to prominence.[15][16] The authors refer to the influencing of behaviour without coercion as libertarian paternalism and the influencers as choice architects.[17][18]

Thaler and Sunstein defined their concept as the following:[19]^: 6

A nudge, as we will use the term, is any aspect of the choice architecture that alters people's behavior in a predictable way without forbidding any options or significantly changing their economic incentives. To count as a mere nudge, the intervention must be easy and cheap to avoid. Nudges are not mandates. Putting fruit at eye level counts as a nudge. Banning junk food does not.

In this form, drawing on behavioral economics, the nudge is more generally applied in order to influence behaviour.

One of the most frequently cited examples of a nudge is the etching of the image of a housefly into the men's room urinals at Amsterdam's Schiphol Airport, which is intended to "improve the aim."[19]

A fly image at the bottom of a urinal has been proven to improve men's aim, leading to lowered cleaning costs.[20]

The book also gained a following among US and UK politicians, in the private sector and in public health.[21]

A nudge makes it more likely that an individual will make a particular choice, or behave in a particular way, by altering the environment so that automatic cognitive processes are triggered to favour the desired outcome.[22][23]

An individual's behaviour is not always in alignment with their intentions (a discrepancy known as a value-action gap).[23] It is common knowledge that humans are not fully rational beings; that is, people will often do something that is not in their own self-interest, even when they are aware that their actions are not in their best interest.[16] As an example, when hungry, people who diet often underestimate their ability to lose weight, and their intentions to eat healthy can be temporarily weakened until they are satiated.[24]

Nobel Laureate Daniel Kahneman describes two distinct systems for processing information as to why people sometimes act against their own self-interest: System 1 is fast, automatic, and highly susceptible to environmental influences; System 2 processing is slow, reflective, and takes into account explicit goals and intentions.[22] When situations are overly complex or overwhelming for an individual's cognitive capacity, or when an individual is faced with time-constraints or other pressures, System 1 processing takes over decision-making.[23][25] System 1 processing relies on various judgmental heuristics to make decisions, resulting in faster decisions.[25] Unfortunately, this can also lead to suboptimal decisions. In fact, Thaler and Sunstein[19] trace maladaptive behaviour to situations in which System 1 processing overrides an individual's explicit values and goals.[23] It is well documented that habitual behaviour is resistant to change without a disruption to the environmental cues that trigger that behaviour.[25]

Nudging techniques aim to use judgmental heuristics to the advantage of the party that is creating the set of choices. In other words, a nudge alters the environment so that when heuristic, or System 1, decision-making is used, the resulting choice will be the most positive or desired outcome.[25] An example of such a nudge is switching the placement of junk food in a store, so that fruit and other healthy options are located next to the cash register, while junk food is relocated to another part of the store.[26]

Nudges are small changes in the environment that are easy and inexpensive to implement.[22] Several different techniques exist for nudging, including defaults, social-proof heuristics, and increasing the salience of the desired option.

A default option is the option that person automatically receives for doing nothing. People are more likely to choose a particular option if it is the default option.[25] For example, Pichert & Katsikopoulos (2008) found that a greater number of consumers chose the renewable energy option for electricity when it was offered as the default option.[27]

A social-proof heuristic refers to the tendency of people to look at the behavior of others to help guide their own behavior. Studies have found some success in using social-proof heuristics to nudge people to make healthier food choices.[28]

When people's attention is drawn toward a particular option, that option will become more salient and they will be more likely to choose it. As an example, in snack shops at train stations in the Netherlands, consumers purchased more fruit and healthy snack options when they were relocated next to the cash register.[26] Since then, other similar studies have been made regarding the placement of healthier food options close to the checkout counter and the effect on the consuming behavior of the customers and this is now considered an effective and well-accepted nudge.[29]

In the 1938 Austrian Anschluss referendum,[32] the larger centered circle was "a 'subtle' hint to the people, to help them understand which way to vote."[33] The intended result, a Ja ("yes") to the annexation of Austria into Germany with Hitler as its leader, was finally achieved through this and other blunter measures.

In the 1978 Chilean national consultation, in addition to the biased question text, the SI ("Yes" to Pinochet and his government) is under a sketch of the flag of Chile while NO is under a lower dark flag. This nudge[32] and other measures got a 79% support for "yes".

There are various notable examples of government applications of nudge theory.

During their terms, both U.K. Prime Minister David Cameron and U.S. President Barack Obama may have sought to employ nudge theory to advance domestic policy goals in their respective countries.[34] In 2008, the United States appointed Cass Sunstein, who helped develop the theory, as administrator of the Office of Information and Regulatory Affairs.[17][35][36] In 2010, the British Behavioural Insights Team, or "Nudge Unit," was established at the British Cabinet Office and headed by psychologist David Halpern.[37]

In Australia, the state Government of New South Wales established a Nudge Unit of its own in 2012.[38] In 2016, the federal government followed suit, forming the Behavioural Economics Team of Australia (BETA) as the "central unit for applying behavioural insights...to public policy."[39]

In 2020, the British government of Boris Johnson decided to rely on nudge theory to fight the coronavirus pandemic, with Chief Scientific Adviser Patrick Vallance seeking to encourage “herd immunity” with this strategy.[40]

Nudge theory has also been applied to business management and corporate culture.

For instance, nudge is applied to health, safety, and environment (HSE) with the primary goals of achieving a "zero accident culture."[41] The concept is also used as a key component in a lot of human-resources software.

Particular forerunners in the application of nudge theory in corporate settings are top Silicon Valley companies. These companies are using nudges in various forms to increase productivity and happiness of employees. Recently, more companies are gaining interest in using what is called "nudge management" to improve the productivity of their white-collar workers.[42]

Lately, nudge theory has also been used in different ways to help healthcare professionals make more deliberate decisions in numerous areas. For example, nudging has been used as a way to improve hand hygiene among healthcare workers to decrease the number of healthcare-associated infections.[43] It has also been used as a way to make fluid administration a more thought-out decision in intensive care units, with the intention of reducing well known complications of fluid overload.[44]

Mandatory display of inspector reports of eatery hygiene as a public 'nudge', have received mixed responses in different countries. A recent meta-analytic review of the hygiene ratings across North America, Europe, Asia, and Oceania has shown that inspector ratings (usually a smiley or a letter grade) is useful at times, but not informative enough for consumers. [45]

Nudge theory can also be applied to fundraising, helping to increase donor contributions and increase continuous donations from the same individual, as well as to entice new donors to give.[46]

There are some simple strategies used when applying nudge theory to this area.[46] The first strategy is to make donating easy: creating default settings that automatically enroll a donor for continuous giving or prompts them to give every so often encourages individuals to continue giving. The second strategy to increase donors is to make giving more enticing, which can include increasing a person's motivation to give through rewards, personalized messages, or focusing on their interests. Personalized messages,[47] small thank-you gifts,[46] and demonstrating the impact one's donation can have on others, have been shown to be more effective when increasing donations.[48][49] Another strategy helpful to increasing donors is using social influence, as people are very influenced by group norms.[50] By allowing donors to become visible to the public and increasing their identifiability, other individuals will be more inclined to give as they conform to the social norms around them.[46] Using peer effects has been shown to increase donations.[51] Finally, timing is important: many studies have demonstrated that there are specific times when individuals are more likely to give,[52] for example during holidays.

Although many nudging theories have been useful to increase donations and donors, many scholars question the ethics of using such techniques on the population.[53] Ruehle et al. (2020), state that one has to always consider an individual's autonomy when designing nudges for a fundraising campaign. They state that the power of others behind messaging and potentially intrusive prompting can cause concern and may be seen as manipulative of donor's autonomy.[53]

Nudges are used at many levels in AI algorithms, for example recommender systems, and their consequences are still being investigated. Two articles appeared in Minds & Machines in 2018 addressed the relation between nudges and Artificial Intelligence, explaining how persuasion and psychometrics can be used by personalised targeting algorithms to influence individual and collective behaviour, sometimes also in unintended ways. [54] [55] In 2020 an article in AI & Society addressed the use of this technology in Algorithmic Regulation. [56]

A piece in the Harvard Business Review published in 2021 was one of the first articles to coin the term "Algorithmic Nudging" (see also Algorithmic Management). The author stresses "Companies are increasingly using algorithms to manage and control individuals not by force, but rather by nudging them into desirable behavior — in other words, learning from their personalized data and altering their choices in some subtle way."[57]

While the concept builds on the work by University of Chicago economist Richard Thaler and Harvard Law School professor Cass Sunstein, "due to recent advances in AI and machine learning, algorithmic nudging is much more powerful than its non-algorithmic counterpart. With so much data about workers’ behavioral patterns at their fingertips, companies can now develop personalized strategies for changing individuals’ decisions and behaviors at large scale. These algorithms can be adjusted in real-time, making the approach even more effective."[57]

One concern researchers in enjoyment-focused contexts, such as tourism, raised is a gap between attitude, intention and behaviour[58][59] because tourists seek pleasure.[60] Several empirical pieces of evidence in the tourism suggest the nudge theory's high effectiveness in reducing the burden of tourists' activities on the environment.[61][62] For instance, tourists consumed more ethical foods,[63] selected more sustainable hotels,[64][65] reused towels and bed linen during hotel stays,[66] increased their intentions to reduce their energy consumption,[67] increased the adoption of tourists' voluntary carbon offsetting[68] and many other examples.