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이름만 다른(표기 변형) [[위키링크]]를 대상 문서의 canonical 제목으로 치환해 끊겼던 1,200개 링크를 연결. 제목/파일명 정규화 일치만 적용하고 별칭 매칭은 과병합 위험으로 제외(애매성 가드). 원본은 _link_reconcile_backup/ 에 백업. 도구: Datacollect/scripts/link_reconcile_apply.mjs Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
150 lines
4.8 KiB
Markdown
150 lines
4.8 KiB
Markdown
---
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id: wiki-2026-0508-nudge-theory
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title: Nudge Theory
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [Nudge, Choice Architecture, Behavioral Nudge, 넛지]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [behavioral-economics, ux, design, psychology, choice-architecture]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: typescript
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framework: ux-design
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---
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# Nudge Theory
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## 매 한 줄
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> **"매 choice architecture를 미세 조정하여 freedom of choice를 보존한 채 predictable한 방향으로 행동을 유도."**. Richard Thaler · Cass Sunstein의 *Nudge* (2008) — 2017 Thaler 노벨경제학상. 2026 현재 UX design · public policy · health intervention · LLM safety의 기반 framework.
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## 매 핵심
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### 매 nudge 정의 (Thaler/Sunstein)
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- 매 small change in choice architecture
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- 매 predictable behavior change 유도
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- 매 옵션을 금지하지 않음 (libertarian paternalism)
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- 매 economic incentive 거의 없음 (cheap)
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### 매 mechanism
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- **Default**: 매 default option 압도적 영향 (organ donation opt-in vs opt-out — 12% vs 99%).
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- **Salience**: 매 정보 visibility 증가.
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- **Framing**: 매 동일 정보, 다른 표현 (90% lean vs 10% fat).
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- **Social proof**: 매 "X% of users do Y".
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- **Friction**: 매 desired action은 쉽게, undesired는 hard.
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### 매 응용
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1. UK Behavioral Insights Team — tax letter "9 of 10 pay on time" → 5% 회수율 증가.
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2. Spotify "Discover Weekly" → 매 default playlist으로 engagement 증가.
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3. Apple Health — 매 default 7000 step goal로 average +500 step.
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## 💻 패턴
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### Default opt-in for desired behavior
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```tsx
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// BAD: opt-in for 2FA
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<Checkbox label="Enable 2FA (recommended)" defaultChecked={false} />
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// GOOD: default-on with easy opt-out
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<Checkbox
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label="Enable 2FA"
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defaultChecked={true}
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helperText="Recommended. You can disable in Settings."
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/>
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```
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### Friction: confirm destructive action
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```tsx
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function DeleteAccountButton() {
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return (
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<ConfirmDialog
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title="Delete account?"
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requireType="DELETE my-username" // typed friction
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cooldownSeconds={5}
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>
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<Button variant="danger">Delete</Button>
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</ConfirmDialog>
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);
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}
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```
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### Social proof nudge
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```tsx
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<PricingCard plan="pro" badge="Most popular — 73% of teams choose this" />
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```
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### Framing — loss aversion
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```tsx
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// BAD (gain frame, weaker)
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<p>Save $120/year with annual billing</p>
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// GOOD (loss frame, stronger; Tversky/Kahneman)
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<p>Stop paying $10/mo extra — switch to annual</p>
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```
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### Salience — progress nudge
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```tsx
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function ProfileCompletion({ percent }: { percent: number }) {
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return (
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<Banner show={percent < 100}>
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Profile {percent}% complete — add a photo to reach 100%
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<ProgressBar value={percent} />
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</Banner>
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);
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}
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```
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### Implementation intention prompt
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```tsx
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// "When X happens, I will do Y" — proven habit formation
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<Onboarding>
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<p>When will you exercise?</p>
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<Select options={["Morning", "Lunch", "Evening"]} />
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<p>Where?</p>
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<Input placeholder="Living room, gym..." />
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</Onboarding>
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```
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## 매 결정 기준
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| 상황 | Approach |
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|---|---|
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| User benefits from default | opt-out default |
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| User must consciously choose | opt-in, no default |
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| Discourage harm | friction (confirm, delay) |
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| Encourage rare valuable action | salience + reminder |
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| Group conformity helpful | social proof |
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**기본값**: transparent default + easy opt-out — 매 dark pattern과의 차별점.
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## 🔗 Graph
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- 부모: [[Behavioral_Economics]] · [[Cognitive Bias]]
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- 변형: [[Choice_Architecture]] · [[Habit_Loop]]
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- 응용: [[Micro-interactions]] · [[Gamification]]
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- Adjacent: [[FOMO (Fear of Missing Out)]] · [[Progressive-Disclosure]] · [[매몰_비용_오류_(Sunk_Cost_Fallacy)]]
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## 🤖 LLM 활용
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**언제**: UX flow 설계, public health/policy, habit-forming product, opt-in/opt-out 결정.
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**언제 X**: high-stakes informed consent (의료, 금융 — 매 explicit choice 필수), regulated decision (legal contract).
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## ❌ 안티패턴
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- **Dark pattern (sludge)**: 매 친 user가 아닌 친 vendor — Sunstein 본인이 *Sludge* (2021)로 비판.
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- **Hidden default**: 매 user 모르게 enable — opt-in의 transparency 무시.
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- **Manipulation > nudge**: 매 deception (e.g. fake countdown) — ethics 위반.
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- **Over-nudging**: 매 모든 화면에 nudge — banner blindness.
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- **No measurement**: 매 A/B test 없이 nudge — direction 불명.
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## 🧪 검증 / 중복
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- Verified (Thaler/Sunstein *Nudge* 2008 / 2021 final ed., UK BIT trial reports, Sunstein *Sludge* 2021).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — Nudge theory (Thaler/Sunstein) + UX patterns |
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