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The field guide

Marketing psychology,
one card per pattern

48 mental models that explain why people buy — each stated in one line, each paired with the move it suggests. No theory without a lever.

Diagnosis — start from the symptom

Thinking tools

Before persuading anyone, aim yourself correctly. These models decide what's worth doing at all.

First principles

Pattern —Break the problem to basic truths and rebuild from there.

Move —Don't copy the competitor's playbook. Ask why five times — you usually find the channel they're on isn't the reason they grow.

Jobs to be done

Pattern —People hire products for an outcome, not for features.

Move —Nobody wants a sending tool; they want booked meetings. Sell the hole, not the drill — in copy, pricing and onboarding.

Inversion

Pattern —Instead of asking how to succeed, ask what guarantees failure.

Move —List everything that would guarantee your campaign fails — wrong list, spam folder, vague ask — and delete those first.

The failure list, written out →

Pareto principle

Pattern —Most results come from a small fraction of efforts.

Move —Find the 20% of segments or campaigns producing 80% of replies, and cut the flattering rest.

Theory of constraints

Pattern —Every system has exactly one bottleneck limiting throughput.

Move —If delivery is fine but nobody replies, more volume won't help. Fix the current bottleneck before optimizing anything else.

Local vs. global optima

Pattern —The best nearby option isn't always the best option.

Move —Perfecting subject lines is pointless if email is the wrong channel for this offer. Zoom out before zooming in.

Opportunity cost

Pattern —Every choice silently costs the alternative you didn't pick.

Move —An hour spent on a dying channel is an hour not spent on a compounding one. Compare every yes against the best alternative no.

Second-order thinking

Pattern —Consider the effects of the effects.

Move —A discount spikes revenue today (first order) and trains buyers to wait for discounts forever (second order). Price the echo.

Probabilistic thinking

Pattern —Think in likelihoods, not certainties.

Move —Don't bet the quarter on one campaign. Assign probabilities, run parallel small bets, and let evidence pick the winner.

Evidence, calculated →

Barbell strategy

Pattern —Extreme safety plus small wild bets beats the middle.

Move —80% of budget into channels that provably work, 20% into weird experiments. Kill the mediocre middle.

How buyers think

The patterns running in your buyer's head while they read your email, your pricing page, your ad.

Social proof

Pattern —People follow what others like them already do.

Move —Show customer counts, named results, familiar logos. Popularity reads as safety — especially to a stranger deciding whether to reply.

Availability heuristic

Pattern —What's easy to recall feels more probable.

Move —Case studies make success easy to imagine — and imaginable feels likely. One vivid, specific story beats ten adjectives.

Confirmation bias

Pattern —People seek what confirms their beliefs and skip the rest.

Move —Meet the belief your reader already holds and extend it. Head-on contradiction loses even when you're right.

Mimetic desire

Pattern —People want things because others want them.

Move —Waitlists, invite-only tiers and 'teams like yours use this' work because desire is contagious, not because access is hard.

Endowment effect

Pattern —Owning something raises its value in your eyes.

Move —Free trials work because giving the product back hurts. Let them own it before you ask them to pay for it.

IKEA effect

Pattern —People overvalue what they helped create.

Move —Let users build something — a sequence, a segment, a dashboard. Their effort becomes your retention.

Zero-price effect

Pattern —Free triggers an irrational preference no low price can match.

Move —Free isn't a price point; it's a different mental category. A genuinely free tier or tool out-pulls any discount.

What we made $0 →

Present bias

Pattern —Immediate rewards feel disproportionately larger than future ones.

Move —"Save two hours this week" beats "see ROI in six months." Put the payoff inside the reader's current sprint.

Status-quo bias

Pattern —The current state feels safer than any change.

Move —Your real competitor is 'do nothing.' Make switching feel like one reversible step, not a migration project.

Default effect

Pattern —People accept whatever is pre-selected.

Move —Pre-select the plan most buyers should pick. Defaults decide more than persuasion does — use that power honestly.

Paradox of choice

Pattern —More options produce fewer decisions.

Move —Three plans, one recommended. Every option you add after that costs you conversions, not goodwill.

Goal-gradient effect

Pattern —People speed up as they approach a goal.

Move —Progress bars and 'step 2 of 3' work because visible progress accelerates effort. Show the finish line.

Peak-end rule

Pattern —Experiences are judged by their peak and their ending.

Move —Design one memorable peak and end strong. The thank-you page and the last email of a sequence carry the whole memory.

Zeigarnik effect

Pattern —Unfinished things occupy the mind more than finished ones.

Move —An open loop — a question raised and not yet answered — keeps your email in their head. Close it in the follow-up.

Pratfall effect

Pattern —A small admitted flaw makes the competent more likable.

Move —"We're not the cheapest" makes everything after it more believable. A named flaw buys trust no superlative can.

Curse of knowledge

Pattern —Once you know something, you can't imagine not knowing it.

Move —Your product is obvious to you and opaque to newcomers. Test copy on someone who's never seen the category.

Persuasion levers

The levers that move a decision — each one works, and each one burns trust if faked. Use with inventory you actually have.

Reciprocity

Pattern —People return favors, almost involuntarily.

Move —Give real value first — a tool, an audit, an answer. The obligation to reciprocate is quiet and powerful.

What we give away →

Commitment & consistency

Pattern —People act in line with commitments they've already made.

Move —Ask for a 15-minute call after they replied, not in email one. Small yeses make the big yes consistent behavior.

Authority bias

Pattern —People defer to recognized expertise.

Move —Credentials, data, named research. Authority transfers — cite it precisely and it lends you its weight.

Liking & similarity

Pattern —People say yes to people like themselves.

Move —"Built by SDRs who sent 2M cold emails" beats any feature list. Similarity is the shortest path to yes.

Unity principle

Pattern —Shared identity persuades more than shared interest.

Move —Talk like a member of your buyer's tribe, not a vendor to it. Insider vocabulary is a credential.

Scarcity

Pattern —Limited availability raises perceived value.

Move —Deadlines and limited seats move decisions — once. Fake scarcity is discovered exactly one purchase later.

Loss aversion

Pattern —Losses hurt about twice as much as equal gains please.

Move —Frame around what inaction costs: "every week this list decays 2%." Losses motivate roughly twice as hard as gains.

The decay math →

Anchoring

Pattern —The first number seen dominates later judgments.

Move —The first number on the page sets the scale for every number after it. Choose your anchor; don't inherit one.

Decoy effect

Pattern —An inferior third option shifts choice between the other two.

Move —A deliberately worse-value tier makes your target tier look obvious. Most three-plan pages already do this — do it on purpose.

Framing effect

Pattern —Presentation changes perception of identical facts.

Move —"95% land in the inbox" and "5% go to spam" are the same fact with different temperatures. Frame deliberately.

Contrast effect

Pattern —Things are judged relative to what sits next to them.

Move —Show the before, vividly. Improvement is invisible without contrast — the gap does the selling.

Foot-in-the-door

Pattern —A small yes makes the next, larger yes likelier.

Move —Open with an ask so small it's easier to accept than ignore. Momentum, not pressure, gets the meeting.

Pricing psychology

Four models that explain most pricing pages you've ever seen.

Charm pricing

Pattern —Prices ending in 9 feel meaningfully lower.

Move —$39 reads as 'thirty-something.' Use charm endings for value positioning; the left digit does the work.

Price fluency

Pattern —Round prices feel premium; precise ones feel calculated.

Move —Round numbers read premium; $200 signals confidence where $199 signals a deal. Match the ending to the story.

Rule of 100

Pattern —Percent discounts win under $100; absolute ones win above.

Move —Under $100, say "20% off." Over $100, say "$50 off." State the discount in whichever unit produces the bigger number.

Good-better-best

Pattern —A middle option between extremes feels reasonable.

Move —Three tiers where the middle is the one you want chosen. The top tier anchors; the bottom tier reassures.

Ours, for inspection →

Design & delivery

Models for the moment of action — the click, the reply, the signup.

Hick's law

Pattern —Decision time grows with the number of options.

Move —One CTA per email, per page, per ad. Every added option slows the decision it's competing with.

Rule of 7

Pattern —Prospects need repeated exposure before acting.

Move —One email rarely converts; a sequence does. Plan for seven honest touches, not one perfect one.

The follow-up curve, measured →

Fogg behavior model

Pattern —Action needs motivation, ability and a prompt at once.

Move —Behavior = motivation × ability × prompt. When outreach fails, diagnose which of the three was missing — usually ability (the ask was too big).

EAST framework

Pattern —Easy, attractive, social, timely behavior happens.

Move —Make the desired action Easy, Attractive, Social and Timely. Four checkboxes worth running every campaign through.

Activation energy

Pattern —The cost of starting blocks more action than the cost of doing.

Move —Pre-fill, template, shorten. The first step should be so small it's harder to refuse than to do.

AIDA

Pattern —Buyers pass through stages; skipping them loses people.

Move —Attention → interest → desire → action, in order. Most weak pages ask for action from readers still at attention.

The only rule

Every lever on this page amplifies what's true. Real scarcity, real proof and real authority are information a buyer deserves; invented ones are debt collected at renewal. We built an entire analytics producton that principle — numbers that survive an audit beat numbers that flatter.

Field questions

Is using marketing psychology manipulative?
No. These patterns describe how people actually decide — they operate whether you design for them or not. The ethical line is inventory: real scarcity, real social proof and real authority are information; invented ones are fraud, and buyers audit claims one purchase later.
Which models matter most for cold email?
Loss aversion, social proof and activation energy. Most cold outreach fails by asking a stranger for too much (activation energy), giving them no reason others said yes (social proof), and framing everything as upside when losses move people harder (loss aversion).
How do I test whether a psychological principle works on my audience?
Treat each model as a hypothesis, not a law. Change one variable per test, measure on replies rather than opens, and let a two-proportion test call the winner — psychology explains the result; it doesn't excuse skipping the measurement.

Keep reading the playbook shelf

Psychology writes the email. Evidence picks the winner.

A/B test any step on real replies — not robot opens — and let the numbers tell you which principle your audience actually responds to.

Start testing