Robert Cialdini

Professor Emeritus, Arizona State University · 1 appearance on the record.

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academicauthorscientistexecutive@RobertCialdini ↗LinkedIn ↗influenceatwork.com ↗Wikipedia ↗YouTube ↗

He is best known for his foundational books Influence: The Psychology of Persuasion and Pre-Suasion, which have sold millions of copies worldwide. Through his company, INFLUENCE AT WORK, he provides executive training, keynotes, and consulting on the application of his science-backed principles of persuasion.

28statements → 15claims → 13claims resolved → 92%fully supported → 4.04/5average certainty → 1.57/5average debate potential → ≈4.5/5argument clarity, estimated → 21said about them ↓

12 supported 1 partly supported 0 contradicted 1 not yet assessed 1 not checkable as stated how the 15 claims stand · each chip opens the sources

15 assertions · 13 insights · every statement was checked. The predictions and assertions are the 15 claims: statements the public record can support or contradict. 13 are resolved, 1 is not yet assessed, and 1 names no date, number or outcome precise enough to check. Everything else (opinions, insights, what ifs, disclosures) can never be settled by the record, so it carries no assessment.

The record, in short

What the tape says about how Robert argues and how the claims held up. Everything they said, and everything said about them, is in the tabs below.

Their most notable supported claim

Assertion Supported
Cialdini: McDonald's Families Bought 25% More Food When Given Balloons First
“The other half, each kid got the balloon as they entered. Those families bought 25% more food because they had been given something first.”
Robert Cialdini Oct 19, 2021 ▶ 7:18 #122 Robert Cialdini - The Principles of Persuasion

Expressed certainty vs assessment result

none yet certainty 1
none yet certainty 2
none yet certainty 3
95% certainty 4
100% certainty 5

weighted support: a fully supported claim counts one, a partly supported claim counts half. Each filled bar is clickable and opens exactly those claims; "none yet" means nothing said at that certainty level has resolved yet

How they sound: not measured why? →

We measure speaking style by listening to the audio itself, and a fair number needs at least 2,000 words from one person on tape we have measured. There is too little of Robert Cialdini on measured tape to publish a rate. This says nothing about how they speak.

Everything Robert Cialdini said on the Knowledge Project that made the record, most notable first. Filter by type, assessment or year in the ledger →

Assertion Not checkable as stated
Cialdini: Humans Are Only Species with Concept of Future Obligation
“I mean, for the first time in evolutionary history, all these species, besides us, never had the concept of future obligation to return what has been provided to them.”
Robert Cialdini Oct 19, 2021 ▶ 5:50 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: McDonald's Families Bought 25% More Food When Given Balloons First
“The other half, each kid got the balloon as they entered. Those families bought 25% more food because they had been given something first.”
Robert Cialdini Oct 19, 2021 ▶ 7:18 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: Reciprocal concessions require an initial rejection, not just contrast
“If we include the contrast in our presentation, you can go anywhere from giving six months for two years, every six weeks for two years, or you could just give to tomorrow. That doesn't produce the effect to the same degree. You have to get them to say no to S…”
Robert Cialdini Oct 19, 2021 ▶ 11:29 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: Tailored Free Gifts Boosted Fast-Food Purchases by 24%
“Researchers did a study. People came in, and one-third of them just went to the to the counter and ordered their food. Another third of them came in and were given a very attractive key ring with a beautiful medallion on it by the management. Oh, thank you for…”
Robert Cialdini Oct 19, 2021 ▶ 14:50 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: 6,700-Site Study Found Scarcity of Supply Top Conversion Driver
“There was a study of 6700 E-commerce sites and A-B tests that were done for various components inside those sites. Does the site have free delivery? Does the site have a search function? Does every appeal end with a call to action? They had 29 of those. The to…”
Robert Cialdini Oct 19, 2021 ▶ 48:43 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: People like those who explicitly express liking them
“It's not just that we like people who are like us. We like people who do like us and say so.”
Robert Cialdini Oct 19, 2021 ▶ 27:38 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: Influence Highlights Existing Principles While Manipulation Counterfeits Them
“And for me, influence involves pointing to them where they naturally exist. That is, informing people into assent by simply raising the profile of that principle in one way or another in your communication. Manipulation involves the fabrication or manufacture …”
Robert Cialdini Oct 19, 2021 ▶ 3:44 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: Upfront Value Pitching Products Is Seen as a Sales Device
“Not based on our product or service. If it's designed to tell them how to buy us, or why they should, then it's seen as a device, not a gift.”
Robert Cialdini Oct 19, 2021 ▶ 8:27 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: People Overpay Favors to Avoid the Stigma of Free-Riding
“We are obligated to give back at the same level, but if the only thing we can do is to give back at a higher level, we will, to avoid the burden of feeling like a cheater, like a free rider, like a taker, an ingrate.”
Robert Cialdini Oct 19, 2021 ▶ 12:21 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: Small Favors Fade Rapidly While Large Favors Endure for Years
“People are more willing to say yes to a request for something in return, the closer to the favor we've provided. However, when they have given us very large favors, those things stay in our consciousness. And years later, we will be willing to give back to the…”
Robert Cialdini Oct 19, 2021 ▶ 13:36 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: Cuban Missile Crisis Ended via Secret Reciprocal Missile Trade
“It turns out that there was a secret deal that was made between Kennedy and Khrushchev. It was a reciprocal concessions deal. Kennedy said, if you will remove your missiles from Cuba, we'll remove ours from Turkey that are pointed at you.”
Robert Cialdini Oct 19, 2021 ▶ 17:50 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: Reciprocity dictates that manipulative exploiters should be exploited
“Treat it as a trick, and if that's the case, Show them the door and keep the fire extinguisher because by the rule of reciprocation, exploiters should be exploited.”
Robert Cialdini Oct 19, 2021 ▶ 21:40 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: Sharing commonalities dropped email negotiation deadlocks from 30% to 6%
“In that case, Stymied negotiations went from 30% to six percent. When the researchers analyzed the data, it wasn't the amount of personalizing information that had been sent across, it was how many commonalities were in those accounts.”
Robert Cialdini Oct 19, 2021 ▶ 23:49 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: Opower prevented 30 billion pounds of CO2 via neighbor comparisons
“Opower has, is responsible for 30 billion pounds of carbon dioxide that have not been released into the environment because people have reduced their energy conservation by just knowing what their comparable neighbors are doing and saying, well, then I can do …”
Robert Cialdini Oct 19, 2021 ▶ 35:02 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: Fake reviews rely on personal stories and verbs instead of nouns
“It turns out there's particular things that allow us to know when the review is phony. Do they use a lot of personal stories? That means they're not giving you Evidence of the features of the product or service because they don't really know. They've just been…”
Robert Cialdini Oct 19, 2021 ▶ 35:41 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: 4.2 to 4.7 star ratings drive higher conversions than 5.0
“There was a great study that looked at which star rating on a product review was most likely to produce a conversion from a prospect to a customer. It wasn't a five-point rating. It was a range between 4.2 and 4.7. People were on to the tricksters who were loa…”
Robert Cialdini Oct 19, 2021 ▶ 36:21 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: Moving expert testimonials to top of Bose ad increased sales 15%
“I know that when Bose Acoustics we were working with them, when they added to an ad for a product that they had called the Bose Wave Music System A line of testifiers right at the start of the ad, all over to the left, just as you read the ad, and up at the to…”
Robert Cialdini Oct 19, 2021 ▶ 40:22 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: Trending Social Proof Persuades More Than Static Market Share
“There's a new research that shows that there's a particularly powerful form of social proof that isn't just a large number of people have done this, but there's a trend to that number. It used to be that last year, we had 30% market share. Six months ago, it w…”
Robert Cialdini Oct 19, 2021 ▶ 49:49 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: Asking 'Will you call to cancel?' reduced restaurant no-shows by 67%
“It was a study done in Chicago with a restaurant owner named Gordon Sinclair. It's a famous restaurant called Gordon's there in Chicago. And he's since retired, but while he was operating, he had a problem. No shows. People who would call, they make a reservat…”
Robert Cialdini Oct 19, 2021 ▶ 52:49 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: Retreating to smaller request raised blood donation compliance to 55%
“We go from 33% of people who agree to give the next day, right, if that's the only thing we ask them, to 55%. If we retreat to that, We make a concession. Oh, so you can't do the two-year thing that we would most like, but would you do this one thing? So now w…”
Robert Cialdini Oct 19, 2021 ▶ 10:13 #122 Robert Cialdini - The Principles of Persuasion
Assertion Supported
Cialdini: Joe Girard averaged six vehicle sales per day
“Joe Girard, he was the world's greatest salesperson, according to the Guinness Book of Records, for like 12 years in a row. He sold automobiles, Chevrolets, from a dealership in Detroit, in the Detroit area. He sold an average of six Cars and trucks a day, eve…”
Robert Cialdini Oct 19, 2021 ▶ 25:50 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: Base purchase decisions on deal terms, not liking the salesperson
“Because you have to recognize, I'm gonna be driving that Toyota off the lot, not the salesperson. It doesn't matter how much I like the salesperson. I can be driving the car. So you have to make your choice based on the favorable features of the deal, not of t…”
Robert Cialdini Oct 19, 2021 ▶ 29:34 #122 Robert Cialdini - The Principles of Persuasion
Insight
Cialdini: Uncertainty drives people to copy peers rather than look inward
“When we're uncertain, we don't look inside ourselves for the answer. All we see is the lack of confidence. So we look outside, and one place we look is to what the people around us, like us, have been doing, or are currently doing in a particular situation.”
Robert Cialdini Oct 19, 2021 ▶ 30:43 #122 Robert Cialdini - The Principles of Persuasion
Assertion Partly supported
Cialdini: Labeling dishes 'most popular' boosted restaurant orders by 13% to 20%
“Those items that got the asterisk then became purchased 13 to 20% more frequently. So what did the asterisk represent? It wasn't what we normally see when there are little asterisks next to items on the menu, like this is a specialty of the house, or this is w…”
Robert Cialdini Oct 19, 2021 ▶ 31:59 #122 Robert Cialdini - The Principles of Persuasion

Show 4statements(4 left)

The other half of the tape: Robert Cialdini's own voice is left out of every number here. Other people bring the name up 18 times in 10 episodes on the Knowledge Project. 3 statements on the record name them. every mention, with the transcript →

Who brings them up most Shane Parrish 7Julia Galef 5Rory Sutherland 2Naval Ravikant 1Josh Wolfe 1Josh Kaufman 1Adam Grant 1

Statements about Robert Cialdini, by other people (3)

Insight
Wolfe: Persuasion tactics from Cialdini, Munger, and Kahneman fail on young kids
“You can use every tactic that Robert Cialdini has come up with, and every tactic from Munger, and every behavioral psychology thing you've learned from Kahneman, and you still get tantrums and crying and dogmatic, you know, intransigent kids”
Josh Wolfe Jan 22, 2019 ▶ 13:51 #50 Josh Wolfe: Inventing the Future
Insight
Sutherland: Reframing attention allows one to synthesize happiness out of nowhere
“By getting us to shift our focus to what's good about something rather than what we assume to be bad about it, you can synthesize happiness out of nowhere.”
Rory Sutherland May 30, 2017 ▶ 9:55 Rory Sutherland: The Psychology of Advertising
Assertion Supported
Parrish: Preceding requests with extreme demands triples compliance to 50%
“First, researchers asked people to supervise delinquents for two years. This got a 100% rejection. But then he asked, will you at least spend one afternoon taking them to the zoo? And the acceptance rate tripled to 50%.”
Shane Parrish Nov 18, 2025 ▶ 31:05 Charlie Munger: The Psychology of Human Misjudgment [Outliers]

Every mention by year

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0042832016201720182019202020212022202320242025episodesmentions
0232016201720182019202020212022202320242025episodes it came up in
0041.5832016201720182019202020212022202320242025episodesmentions per episode
2025 4 mentions in 3 episodes 1 per episode
2021 2 mentions in 2 episodes 1 per episode
2019 1 mention in 1 episode
2017 4 mentions in 3 episodes 1 per episode
2016 7 mentions in 1 episode

Appearances (1)

EpisodeDateSpeaking time
#122 Robert Cialdini - The Principles of Persuasion Oct 19, 2021 50m
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