| name | marketing-psychology |
| description | Use when the user wants to apply psychological principles or behavioral science to marketing, copy, or design. Also use when the user mentions 'psychology,' 'persuasion,' 'cognitive biases,' 'behavioral economics,' 'why do people buy,' 'how to make my page more persuasive,' or 'what motivates customers.' |
Marketing Psychology & Behavioral Science
Expert knowledge for applying psychological principles and behavioral economics to marketing copy, design, and campaigns.
Cialdini's 7 Principles of Influence
1. Reciprocity — Give first. Free resources, free trials that deliver real value, helpful email content before any ask.
2. Commitment and Consistency — Get small yeses first. Quiz funnels, free trial → paid trial → annual plan escalation, interactive calculators.
3. Social Proof — When uncertain, people look to others.
| Type | Power | Example |
|---|
| Expert endorsement | High | "Recommended by [authority]" |
| Customer testimonials | High | Specific outcome + customer name |
| User counts | Medium | "Join 50,000+ teams" |
| Ratings and reviews | Medium | "4.8/5 from 1,200 reviews" |
| Logo walls | Medium | Customer logo bars |
Match proof to ICP identity — a mid-market prospect is more persuaded by a similar company than a Fortune 500.
4. Authority — Author credentials, media mentions, data-backed claims, thought leadership content.
5. Liking — Authentic brand voice, shared values, founder-led content, customer spotlights.
6. Scarcity — Use only genuine scarcity: limited beta access, real deadlines, limited seats. Fake scarcity damages trust.
7. Unity — "For [specific identity] by [specific identity]" positioning. Language that signals insider knowledge.
Kahneman: System 1 and System 2
System 1: Fast, automatic, emotional. Most buying decisions are made here.
System 2: Slow, deliberate, rational. Justifies System 1 decisions.
Design your hero section for System 1. Support with System 2 content below the fold.
Key Cognitive Biases
Loss Aversion (losses feel 2× more painful than gains feel good):
- "Don't lose your data" > "Save your data"
- Trial expiry warnings
- Money-back guarantees as risk reversal
Anchoring (first number heavily influences judgment):
- Show highest tier first
- Show annual price before monthly
- Crossed-out original price next to sale price
The Framing Effect:
- "90% success rate" vs "10% failure rate" — same fact, different feel
- "Only $4/day" vs "$120/month" — same price, different salience
The Decoy Effect:
| Plan | Price | Effect |
|---|
| Basic | $29/mo | Anchor |
| Pro (target) | $79/mo | Looks like the smart choice |
| Enterprise | $89/mo | Makes Pro look like a steal |
The Zeigarnik Effect — people feel compelled to complete uncompleted tasks:
- Onboarding progress bars
- "You're almost ready" prompts
- Email sequences referencing unfinished actions
Mere Exposure Effect — familiarity breeds preference:
- Retargeting campaigns
- Consistent brand identity across touchpoints
The Behavioral Design Stack
- Default to the desired behavior (pre-select recommended plan)
- Reduce friction for desired actions
- Add friction to undesired actions (confirm before cancel)
- Use social norms ("Most customers choose...")
- Make the desired path the obvious path
Ethical Use
Use psychology to help people make decisions that are genuinely good for them. Never use dark patterns, fake urgency, or manipulation.
Common Rationalizations
| Rationalization | Reality |
|---|
| "Our customers are rational" | All customers are human. System 1 precedes System 2 in every buying decision. |
| "Adding urgency always helps" | Fake urgency destroys trust when discovered. Use only real scarcity. |
| "Social proof doesn't matter in B2B" | B2B buyers have career risk. Social proof reduces perceived risk. |
| "This is too subtle to make a difference" | Anchoring and framing effects produce measurable conversion differences. |
