Behavioural insights and ‘nudge’ theory | 行为洞察与‘助推’理论

📚 Behavioural insights and ‘nudge’ theory | 行为洞察与‘助推’理论

Understanding how people actually make decisions – often irrationally – has become a cornerstone of modern economic policy. Behavioural insights challenge the traditional assumption of homo economicus and demonstrate that small changes in the environment can significantly alter behaviour. The ‘nudge’ theory, popularised by Richard Thaler and Cass Sunstein, provides a framework for designing policies that gently steer individuals towards better choices without restricting their freedom.

理解人们实际上如何做决策——往往是非理性的——已经成为现代经济政策的基石。行为洞察挑战了传统的‘经济人’假设，并证明环境中的微小变化可以显著改变行为。由理查德·塞勒和卡斯·桑斯坦推广的‘助推’理论，为设计旨在温和引导个人做出更好选择而不限制其自由的政策提供了框架。

1. The limits of rational choice | 理性选择的局限

Neoclassical economics assumes that individuals are rational utility maximisers with stable preferences and perfect information. In reality, people have bounded rationality, limited willpower and are influenced by emotions. These systematic deviations from rationality are central to behavioural economics.

新古典经济学假设个体是具有稳定偏好和完全信息的理性效用最大化者。实际上，人们具有有限理性、有限意志力并受情绪影响。这些系统性地偏离理性是行为经济学的核心。

Bounded rationality, a concept introduced by Herbert Simon, means that individuals cannot process all available information, so they satisfice rather than optimise. This leads to decisions that may not be in their long-term best interest, such as procrastinating on saving for retirement or choosing unhealthy convenience foods.

有限理性，由赫伯特·西蒙引入的概念，意味着个体无法处理所有可得信息，因此他们追求‘满意’而非‘最优’。这会导致不符合其长期最佳利益的决策，例如拖延为退休储蓄或选择不健康的便利食品。

2. Heuristics, biases and the dual-system mind | 启发式、偏差与双系统思维

Psychologists Daniel Kahneman and Amos Tversky showed that people rely on mental shortcuts, or heuristics, which often lead to systematic biases. The dual-system model describes System 1 (fast, automatic, intuitive) and System 2 (slow, deliberative, analytical). Many economic decisions are driven by System 1, resulting in predictable errors.

心理学家丹尼尔·卡尼曼和阿莫斯·特沃斯基指出，人们依赖心理捷径或启发式，这往往导致系统性偏差。双系统模型描述了系统1（快速、自动、直觉）和系统2（缓慢、深思、分析）。许多经济决策由系统1驱动，从而导致可预测的错误。

Common biases relevant to consumer behaviour include present bias (overvaluing immediate rewards), loss aversion (losses hurt more than equivalent gains), anchoring (relying too heavily on the first piece of information) and status quo bias (sticking with the default). These biases can cause market failures, such as under-consumption of merit goods like education and pensions.

与消费者行为相关的常见偏差包括当下偏差（高估即时回报）、损失厌恶（损失比同等收益更令人痛苦）、锚定效应（过度依赖第一手信息）和现状偏差（维持默认选项）。这些偏差可能导致市场失灵，例如对教育和养老金等优效品的消费不足。

3. What is nudge theory? | 什么是助推理论？

A nudge is any aspect of choice architecture that alters people’s behaviour in a predictable way without forbidding any options or significantly changing economic incentives. Thaler and Sunstein’s 2008 book Nudge defined it as a ‘libertarian paternalist’ approach: preserving freedom of choice while steering individuals towards decisions that improve their welfare.

助推是选择架构中能够以可预测的方式改变人们行为的任何方面，无需禁止任何选项或显著改变经济激励。塞勒和桑斯坦2008年的著作《助推》将其定义为一种‘自由意志家长主义’方法：在保留选择自由的同时，引导个体做出改善其福利的决策。

A key distinction is that nudges do not rely on taxation, subsidies or legal bans. For instance, placing fruit at eye level in a school canteen is a nudge; banning sugary drinks is not. Nudges work with human cognitive biases rather than against them, making them a distinctive policy tool for governments.

一个关键区别是，助推不依赖税收、补贴或法律禁令。例如，将水果放在学校食堂的视线水平位置是助推；禁止含糖饮料则不是。助推利用人类的认知偏差而非对抗它们，使其成为政府独特的政策工具。

4. The toolkit of choice architecture | 选择架构的工具箱

Choice architecture refers to the design of environments in which people make decisions. Several robust techniques have been identified through behavioural insights:

选择架构指的是人们做出决策的环境设计。通过行为洞察已经确定了几种稳健的技术：

• Defaults: Opt-out systems for pensions or organ donation dramatically increase participation because of status quo bias and inertia.
• 默认选项：养老金或器官捐献的自动加入系统因现状偏差和惯性而大幅提升参与率。

• Social norms: Informing people that ‘most of your neighbours pay their taxes on time’ leverages the desire to conform.
• 社会规范：告知人们‘您的大多数邻居都按时缴税’利用了从众心理。

• Framing: Presenting the same information as a gain rather than a loss changes responses (e.g. ‘90% fat-free’ vs ‘10% fat’).
• 框架效应：将相同信息呈现为收益而非损失会改变反应（例如‘90%无脂肪’对比‘含10%脂肪’）。

• Salience: Making certain features more noticeable, such as calorie labels on menus, shifts attention and behaviour.
• 显著性：让某些特征更显眼，比如菜单上的卡路里标签，转移注意力和行为。

These tools are often combined. The UK Behavioural Insights Team (BIT) used redesigned tax reminder letters incorporating social norms and simplified messages to raise tax compliance by millions of pounds.

这些工具经常结合使用。英国行为洞察团队（BIT）使用结合社会规范和简化信息的重新设计的税务提醒信，将税收合规性提升了数百万英镑。

5. Defaults and automatic enrolment in pensions | 默认选项与养老金自动加入

One of the most celebrated applications of nudge theory is automatic enrolment in workplace pensions. Under traditional opt-in systems, employees had to actively choose to save, leading to low participation rates, especially among younger workers. In 2012 the UK introduced auto-enrolment, where employees are enrolled by default but can opt out.

助推理论最著名的应用之一是职场养老金的自动加入。在传统的选择加入系统下，员工必须主动选择储蓄，导致参与率低，尤其是年轻员工。2012年英国引入了自动加入制度，员工默认加入但可选择退出。

The result was a sharp rise in pension participation from around 55% in 2012 to over 88% of eligible employees by 2019, according to ONS data. The nudge exploited status quo bias, present bias and inertia. Critics note that default contribution rates are often too low to secure adequate retirement incomes, showing that nudges may need to be reinforced.

根据英国国家统计局的数据，结果是养老金参与率从2012年约55%急剧上升至2019年超过88%的合格员工。该助推利用了现状偏差、当下偏差和惯性。批评者指出，默认缴费率往往太低，无法保障足够的退休收入，这表明助推可能需要加强。

6. Organ donation and presumed consent | 器官捐献与推定同意

Changing the default rule for organ donation from opt-in to opt-out (presumed consent) has been a classic nudge. In countries like Spain and Wales, shifting the default dramatically increased the number of registered donors because people tend to stick with the pre-set option rather than actively making a different choice.

将器官捐献的默认规则从选择加入改为选择退出（推定同意）是一个经典的助推。在西班牙和威尔士等国家，改变默认设置极大地增加了注册捐献者数量，因为人们倾向于坚持预设选项，而不是主动做出不同选择。

However, the nudge is not always sufficient on its own: Spain’s high donation rates also rely on a well-structured system of transplant coordinators in hospitals. This illustrates that choice architecture often works alongside other institutional factors. Ethically, presumed consent must be accompanied by public education to ensure informed consent is truly possible.

但是，该助推本身并不总是足够的：西班牙的高捐献率还依赖于医院中结构良好的移植协调员系统。这表明选择架构通常与其他制度因素共同作用。在伦理上，推定同意必须辅以公众教育，以确保真正可能实现知情同意。

7. Nudging towards healthier consumption | 助推更健康的消费

Public health campaigns increasingly use behavioural insights to tackle obesity, smoking and alcohol abuse. Examples include placing healthier food options in prominent positions, reducing plate sizes to limit portion distortion, and introducing graphic health warnings on cigarette packets.

公共卫生运动越来越多地使用行为洞察来解决肥胖、吸烟和酗酒问题。例子包括将更健康的食品放在显眼位置，减小餐盘尺寸以限制份量感知失真，以及在香烟包装上引入图形健康警告。

In 2018 the UK introduced a Soft Drinks Industry Levy, which is a tax, not a pure nudge, but its design incorporated nudge elements: it encouraged reformulation of drinks to reduce sugar content by giving producers an incentive to avoid the levy. The sugar content of soft drinks fell by 29% between 2015 and 2019. This blend of standard economics and behavioural insight is sometimes called ‘nudge-plus’.

2018年英国引入了软饮料行业税，这是一项税收，不是纯粹的助推，但其设计融入了助推元素：通过激励生产商避免征税，鼓励饮料配方调整以降低含糖量。2015年至2019年间，软饮料的含糖量下降了29%。这种标准经济学与行为洞察的结合有时被称为‘助推加’。

8. Nudges in financial decision-making | 财务决策中的助推

Behavioural insights have transformed retail finance by simplifying product information and using commitment devices. The Financial Conduct Authority (FCA) in the UK has tested interventions such as switching prompts to help consumers get better deals on credit cards and mortgages.

行为洞察通过简化产品信息和使用承诺机制改变了零售金融。英国金融行为监管局（FCA）已经测试了诸如转换提示等干预措施，帮助消费者在信用卡和抵押贷款上获得更好的交易。

A powerful nudge is the use of text reminders and personal commitments to increase savings. For example, the ‘Save More Tomorrow’ programme invites workers to commit to allocate a portion of future pay rises to retirement savings, harnessing present bias by delaying pain to a future date. Experiments show substantial increases in saving rates.

一个强大的助推是使用短信提醒和个人承诺来增加储蓄。例如，‘明天储蓄更多’计划邀请员工承诺将未来加薪的一部分分配用于退休储蓄，通过将痛苦推迟到未来某个日期来利用当下偏差。实验显示储蓄率大幅提高。

9. Comparing nudges with traditional policy tools | 助推与传统政策工具的比较

Governments have several intervention strategies: regulation and legislation, taxation and subsidies, information and education, and nudges. A comparison reveals the distinct nature of nudge-based approaches.

政府有几种干预策略：监管与立法、税收与补贴、信息与教育以及助推。比较揭示了基于助推方法的独特性质。

Policy tool	Mechanism	Freedom preserved?	Cost to government
Regulation/ban	Prohibition, coercion	No	Enforcement costs
Tax/subsidy	Price incentives	Yes, but changes relative prices	Revenue/admin costs
Information campaign	Education, persuasion	Yes	Low to moderate
Nudge	Choice architecture	Yes, easy to opt out	Usually low

Nudges are attractive because they are often cheap, respect autonomy and can be politically easier to implement than mandates or taxes. Yet their effectiveness depends heavily on context and careful design; poorly designed nudges can be ineffective or even backfire.

助推具有吸引力，因为它们通常成本低廉、尊重自主权，并且在政治上比强制要求或税收更容易实施。但其有效性高度依赖于环境和精心设计；设计不佳的助推可能无效甚至适得其反。

10. Evaluating the effectiveness and ethics of nudging | 助推的有效性与伦理评估

Evidence from randomised controlled trials (RCTs) by the BIT and other units shows that nudges can have measurable effects, but effect sizes are often modest. A tax letter nudge might lift compliance by a few percentage points, yet that translates into billions of tax revenue when scaled nationally.

来自BIT和其他部门的随机对照试验证据显示，助推可以产生可衡量的效果，但效应量通常不大。一封税务信函的助推也许只能将合规性提升几个百分点，但在全国范围内推广时，这转化为数十亿的税收收入。

Cricitisms of nudge theory include concerns about manipulation and a lack of transparency. If individuals are unaware they are being nudged, it raises questions about autonomy. Additionally, nudges alone may be insufficient to address deep-rooted structural problems such as poverty or inequality. There are also worries that governments could use nudges for purposes that benefit commercial or political interests rather than citizens.

对助推理论的批评包括对操纵和缺乏透明度的担忧。如果个体不知道他们正在被助推，这引发了对自主权的质疑。此外，仅靠助推可能不足以解决贫困或不平等这类根深蒂固的结构性问题。也有人担心政府可能将助推用于有利于商业或政治利益而非公民的目的。

Proponents argue that any environment already has a choice architecture, so doing nothing is also a form of design. Making architecture more beneficial while maintaining easy opt-outs is thus justified. The debate centres on whether transparency (e.g. disclosing the use of nudges) preserves legitimacy.

支持者认为，任何环境都已经存在选择架构，因此无所作为也是一种设计形式。使架构更有利同时保持方便的退出选项因此是合理的。辩论的中心在于透明度（例如披露助推的使用）是否能保持其合法性。

---

Published by TutorHao | Economics Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）