Nudge: Improving Decisions About Health, Wealth, and Happiness

Citation

Thaler, R. H., & Sunstein, C. R. (2008). Nudge: Improving Decisions About Health, Wealth, and Happiness. Yale University Press.

Chapter Summary

The 2008 edition runs to about 290 pages, with an introduction, eighteen chapters in five parts, notes and a bibliography. A rewritten "Final Edition" appeared in 2021, so chapter content and numbering in newer printings may differ from the contents below.

Part 1: Humans and Econs (Chapters 1–5)

The opening part sets out the problem and the proposed remedy. Chapter 1, "Biases and Blunders", and Chapter 2, "Resisting Temptation", deal with systematic errors in judgement and with self-control. Chapter 3, "Following the Herd", turns to social influence. Chapter 4, "When Do We Need a Nudge?", asks in which situations people need help, and Chapter 5, "Choice Architecture", introduces the design of the environment in which choices are made. These five chapters carry the book's central ideas; the rest applies them.

Part 2: Money (Chapters 6–9)

Four chapters apply the framework to financial decisions: "Save More Tomorrow" (6), "Naïve Investing" (7), "Credit Markets" (8) and "Privatizing Social Security: Smorgasbord Style" (9). Retirement saving, investing, borrowing and the design of Social Security accounts are the settings in which the authors test their approach.

Part 3: Health (Chapters 10–12)

Chapter 10, "Prescription Drugs: Part D for Daunting", discusses the choices facing people who enrolled in the United States Medicare drug benefit. Chapter 11, "How to Increase Organ Donations", and Chapter 12, "Saving the Planet", extend the argument to organ donation and to environmental problems.

Part 4: Freedom (Chapters 13–15)

The most policy-oriented part takes up "Improving School Choices" (13), "Should Patients Be Forced to Buy Lottery Tickets?" (14) and "Privatizing Marriage" (15). The part heading suggests that these chapters test how far the approach respects freedom of choice.

Part 5: Extensions and Objections (Chapters 16–18)

Chapter 16, "A Dozen Nudges", collects further examples. Chapter 17, "Objections", answers critics, and Chapter 18, "The Real Third Way", closes the book; its title presents the authors' position as a "real third way".

Key Concepts

Part 1: Humans and Econs

• Econs and Humans: the part title contrasts the perfectly rational agent of standard economic models with real people.
• Biases and blunders: predictable errors in judgement that Chapter 1 sets against the assumption of unfailing good choices.
• Herd behaviour: the influence of other people's choices, the subject of Chapter 3.
• Choice architecture: the way a decision is presented shapes what people choose, the idea the authors build their proposals on.

Parts 2–5

• Save More Tomorrow: the retirement-saving design featured in the title of Chapter 6.
• Libertarian paternalism: the authors' position, that choices can be steered while people stay free to opt out; Chapter 18 presents it as "The Real Third Way".

Critical Analysis

Strengths

• A clear core with many applications. The first five chapters state the ideas, and the remaining thirteen apply them to money, health, schools, marriage and the environment, so a reader can see the same framework used in different fields.
• It meets objections directly. Chapter 17 is devoted to objections and Chapter 18 to the authors' own position, which makes the book useful for classes that want to discuss the ethics of influencing choices.
• Wide reception. The Economist named it among the best books of 2008, and the Guardian reviewer praised its tone as amusing and elucidating, according to published reviews.

Limitations

• Argument by long list of examples. Reviewers disagreed on style. Bryan Appleyard in The Times called it a very dull read, a "dogged march" through policies, and Christopher Shea in the Washington Post judged the proposals and study summaries wearisome in the end.
• Open questions about the idea. Elizabeth Kolbert in The New Yorker asked why, if people cannot recognise their own interests, one should stop at a nudge, and whom to trust to decide for others. Gerd Gigerenzer later argued that almost everything affecting behaviour had come to be called a nudge, which weakens the term.
• Evidence for effects. A 2011 House of Lords sub-committee review of behaviour change reported little evidence of effective impact for nudges alone, according to an interview with its chair; later work on the long-term effects of nudging is not covered in a 2008 book.
• Dated policy detail. The Medicare Part D and Social Security chapters respond to American policy of the mid-2000s.

Where It Fits in the Course

This is the policy-facing book in a list on judgement and decision making. Kahneman's Thinking, Fast and Slow is a general account of the two modes of thought and the biases they produce, and it covers the psychology of judgement on which Part 1 draws. Evans's Thinking and Reasoning: A Very Short Introduction is a compact survey of how people reason, and Bazerman and Moore's Judgment in Managerial Decision Making is a short text on decision errors in organisations. Hastie and Dawes's Rational Choice in an Uncertain World and Baron's Thinking and Deciding are fuller textbooks, and Gigerenzer and colleagues' Simple Heuristics That Make Us Smart presents a research programme that treats heuristics as often effective.

Read Nudge after one of the general accounts, or in parallel with a textbook, when the question is what to do about biases rather than how to describe them. Pair it with Gigerenzer for a counterweight, since he is among its critics.

How to Use This Book

The book assumes no technical background; it is written for general readers and for students of economics, psychology, law and public policy. A reader with limited time can read the introduction and Part 1, choose the applied chapters that match their interests, and finish with Part 5.

A practical plan is to read Chapters 1–5 first and then one chapter from Parts 2–4, noting for each proposal what the default is, what the nudge changes, and what freedom is kept. Read Chapters 17–18 before forming a view, and then compare the arguments with the critiques of Appleyard, Kolbert and Gigerenzer cited above. Because the 2021 Final Edition was rewritten, check which edition a course assigns before matching chapter numbers.