Lionel Page @page_eco Twitter profile

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Lionel Page

@page_eco

1 year

After several years in the making, I am finally holding it in my hand!

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Lionel Page

@page_eco

5 years

Brilliant demonstration of Newton’s principle of inertia.

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Lionel Page

@page_eco

4 years

Scientist: carefully designs experiment Participant:

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Lionel Page

@page_eco

2 years

It is regrettable that many Western commentators repeated Putin’s narrative that the problem came from an aggressive NATO expansion aimed at encircling Russia. Time for a reset of narratives. Here are some simple insights, informed by our work on the game theory of alliances. 🧵

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Lionel Page

@page_eco

4 years

Amazing: a trail of termites (up) and a trail of ants (down), both protected by a row of their soldiers in a stand-off, without fighting. from @mehdi_moussaid

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Lionel Page

@page_eco

5 years

Such a cool way to explain logic gates.

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Lionel Page

@page_eco

5 years

This is a black and white photograph. Only the lines have colour. What you “see” is what your 🧠 predicts the reality to be, given the imperfect information it gets.

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Lionel Page

@page_eco

5 years

All co-authors contributed equally.

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Lionel Page

@page_eco

4 years

Brilliant: When the euro bank notes were designed, they used European-style bridges which were *non-existing*, not to have to choose between countries. The Dutch town of Spijkenisse claimed them all for the Netherlands by building them on a waterway.

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Lionel Page

@page_eco

6 years

- Senator: Would you be comfortable sharing with us the name of the hotel you stayed in last night? - Zuckerberg: Eh... No - Senator: I think that maybe is what this is all about. Your right to privacy.

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Lionel Page

@page_eco

3 years

Somebody did a simulation of a giant 🍌 orbiting around the 🌍 at the distance of the ISS. And, surprisingly, it challenges our intuitions of how orbiting objects would look like in the sky.

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Lionel Page

@page_eco

3 years

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Lionel Page

@page_eco

4 years

This 1944 CIA memo, on how to infiltrate an organisation and make it dysfunctional, is amazing. Worth framing in the coffee room of every company. ht @esportslaw

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Lionel Page

@page_eco

5 years

Economists designing institutions for people to make better decisions. 👉 Slow feed bowl People adapting their behaviour accordingly. 👉 Dog

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Lionel Page

@page_eco

6 years

Cats can also be game theorists. Problem: coordination game. A resource can only be accessed by one player at any given moment. Solution (when game lasts long enough): turn-taking strategy. How it is enforced: emergence of a norm of reciprocal sharing.

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Lionel Page

@page_eco

4 years

An excellent illustration of our ability to interpret new information in a way consistent with our beliefs. via @chazfirestone

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Lionel Page

@page_eco

4 years

So cool: the geometry of billiards shots, explained simply.

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Lionel Page

@page_eco

4 years

The Four COVID Personality Types

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Lionel Page

@page_eco

4 years

One of my favourite examples of how people react to economic incentives: Architectural tax avoidance👇 🇬🇧 UK : tax on windows 🇻🇳 Vietnam: tax on frontage 🇫🇷 France: tax on floors (roof exempted) 🇧🇷 Brazil: tax on church construction (when finished)

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Lionel Page

@page_eco

5 years

This “rotating” building actually does not move. A great example of the relative motion illusion, frequent in train stations.

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Lionel Page

@page_eco

2 years

It’s incredible that some in the West keep repeating Putin’s propaganda about “Nazis in Ukraine”. Truth: the far-right is smaller in Ukraine than in most European countries. 🇫🇷 34% (2017) 🇮🇹 17% (2018) 🇪🇸 15% (2019) 🇧🇪 12% 2019) 🇳🇱 11% (2021) 🇩🇪 10% (2021) 👉🇺🇦 2% (2019)

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Lionel Page

@page_eco

4 years

Amazing animation of how the Charles Bridge was built in Prague in the 14th century. We easily underestimate the technical knowledge people had in the past.

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Lionel Page

@page_eco

6 years

This map superimposes the border of the German Empire (1871-1918) on the electoral results of the 2007 Parliamentary elections in Poland. Another great example of the long term impact of past institutions. Orange/red = PO, centre right Blue = PIS, right (currently in power)

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Lionel Page

@page_eco

4 years

Amazing social behaviour of striped catfish, forming a creature like shape. Fish at the bottom graze, while those at the top are on the lookout.

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Lionel Page

@page_eco

5 years

Visual proof that the exterior angles of the side of a polygon always add to 360 degrees. by @MagicPi2

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Lionel Page

@page_eco

5 years

Is this the best timed TV sequence ever? James Burke covering live the Apollo 11 mission for the BBC in 1969. ht @bluedotfestival

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Lionel Page

@page_eco

3 years

Another fascinating mind-bending illusion. There is no yellow in the circle below (!). Instead, our brain very confidently fills the gap of the colour scheme. by @AkiyoshiKitaoka

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Lionel Page

@page_eco

2 years

Behind Macron’s victory there is a large social divide. Macron got 71% of professionals/managers. Le Pen got 68% of workers. In France, like in the US and other countries, the political fight is not between left and right anymore. A 🧵

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Lionel Page

@page_eco

1 year

Here is a great explanation of the Lagrangian multiplier (the intuition of which is typically not given). 🧵 The problem: maximising a function f(x,y) under a constraint g(x,y)=k (the point has to be on the red curve).

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Lionel Page

@page_eco

5 years

A beautiful visual demonstration of how mathematical patterns emerge from random events. (using a Galton board)

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Lionel Page

@page_eco

5 years

Design vs user experience.

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Lionel Page

@page_eco

2 years

The notion of “probability” is both familiar (we use it), and mysterious (we would typically struggle to define it). Here is a 🧵 to remove the mystery and make the meaning of “probability” more intuitive.

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Lionel Page

@page_eco

2 years

The “protection of an ethnic minority” argument is a go-to excuse to interfere in another country, and therefore could not provide confidence in the future attitude of Russia. The current events provide, unfortunately, a vivid demonstration.

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Lionel Page

@page_eco

5 years

Fascinating: Moore’s Law predictions vs actual growth in transistor count. by @datagrapha

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Lionel Page

@page_eco

2 years

We need to stop the “NATO aggression” narrative. It has been used as an excuse by an authoritarian state to: - crush the democratic aspirations of peoples in several European countries, - reinforce the police strate in Russia against the aspirations of Russian citizens.

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Lionel Page

@page_eco

5 years

Perspective matters

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Lionel Page

@page_eco

3 years

Brilliant 3D cube illusion. You “see” it, even though you know it’s not there.

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Lionel Page

@page_eco

4 years

So cool: research on altruism at an early age. Toddlers recognise others’ intentions and try to help.

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Lionel Page

@page_eco

2 years

In short, Eastern European countries had a choice, they opted for the European Union and NATO, when they could, for the security it offered them. Remember, this was Kyiv in 2014.

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Lionel Page

@page_eco

2 years

It is mind-boggling how many commentators in the West have blamed NATO’s aggressiveness. When, instead, NATO has repeatedly opted not to fight to stop Russian military interventions in Georgia, Syria, and Ukraine.

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Lionel Page

@page_eco

3 years

Everybody should know about Berkson’s paradox. 👉 When two positive traits are (spuriously) negatively correlated, in a population *selected on these traits*. Examples: 1/ “Handsome men are jerks.” via @anecdatally

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Lionel Page

@page_eco

4 years

Very cool: same speed, different fields of view. Your 🧠 uses objects’ velocity relative to each other to form a perception of speed.

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Lionel Page

@page_eco

2 years

NATO is a voluntary association, and an association with Russia would also have (initially) been largely voluntarily. But Eastern European countries *demanded* to join NATO. While NATO countries were initially not warm about this prospect.

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Lionel Page

@page_eco

3 years

Your periodic reminder not to compare impact factors across disciplines: Medical paper “invents” a way to estimate the area under a curve using rectangles. Gets over 400 citations

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Lionel Page

@page_eco

5 years

How people come up with “random” numbers: A: “Pick a random number from 1-10” B: 🤔°(1 and 10 are too obvious. 5 stands out in the middle. Half way between 5 and 10 is hidden in the mix. It won’t be the same number other picked 😁.) “Seven”

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Lionel Page

@page_eco

5 years

🇫🇷 Landreau vs 🇧🇷 Ronaldinho (2002) One of the most interesting penalties ever for behavioural game theory: the goalie making a direction stand out to play a mind game.

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Lionel Page

@page_eco

2 years

These concerns are why Eastern European countries have been interested to join the EU and NATO: they try to escape the threat of being vassalised in an alliance with Russia. And NATO’s aggressive expansion? NATO countries have rejected Ukraine’s and Georgia’s membership. 👇

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Lionel Page

@page_eco

2 years

/end These insights are informed by our work on coalitional game theory, where we used Russia and its alliance as an illustration of a “too big to prevail” paradox.

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Lionel Page

@page_eco

5 years

Is this a libertarian experiment? ht @s_mmmdv

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Lionel Page

@page_eco

2 years

The reasons are now obvious for everybody to see. Small countries run the risk of being bullied in an alliance with a hegemonic partner. In such an alliance, they have very low bargaining power 👉 they are at the mercy of later “revisions” of the terms of the alliance.

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Lionel Page

@page_eco

5 years

This time lapse gives an idea of the size of the Hong-Kong demonstration on Sunday. 2 million demonstrated (for a population of 7 million).

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Lionel Page

@page_eco

5 years

Such a simple demonstration that: (a+b)²=a²+2ab+b² by @panlepan

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Lionel Page

@page_eco

3 years

Metaphor for every financial bubble.

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Lionel Page

@page_eco

5 years

“When infighting makes you lose sight of the big picture.” From @konradweber

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Lionel Page

@page_eco

2 years

The reaction from satellite countries was not paranoid. Russia used pressure to force Georgia and Moldova in the CIS. Then it established the “Monroeski Doctrine”, stating its right to intervene in CIS states to “protect” the right of ethnic Russians.

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Lionel Page

@page_eco

5 years

Amazing: AI used to animate heads using only one picture. By Samsung AI lab, ht @DmitryUlyanovML

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Lionel Page

@page_eco

2 years

A way to picture the magnitude of the wealth accumulated by Russian oligarchs. One oligarch’s super yacht seized in Italy is worth more than all the money pledged by the EU to arm Ukraine.

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Lionel Page

@page_eco

4 years

A visual demonstration of why it takes time to properly wash our hands.

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Lionel Page

@page_eco

2 years

What about countries from the former USSR (Georgia, Armenia, Ukraine)? Russia proposed an economic integration, the “Community of Independent States” (CIS). It failed because the other countries resisted integration. CIS 👇

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Lionel Page

@page_eco

6 years

Striking identical results from different countries: the gender gap in income is primarily driven by motherhood. In order: 1) Denmark 2) Sweden 3) New-Zealand

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Lionel Page

@page_eco

2 years

It's surprising how some Western commentators are *still* complacently repeating Putin's propaganda. Candace Owen: Ukraine wasn't a thing until Russians created it in 1989. Voltaire (1731): "Ukraine has always aspired to liberty".

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Lionel Page

@page_eco

2 years

As a consequence of these concerns. Countries skeptics about an integration with Russia created in 1997-99 the GUUAM group (Georgia, Ukraine, Uzbekistan, Azerbaijan, Moldova), to increase their bargaining power against Russia,

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Lionel Page

@page_eco

5 years

Excellent animation showing how rich people think they are middle class. Barely anybody believes to belong to the top 20% (here in Austria). By @matschnetzer

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Lionel Page

@page_eco

5 years

A picture which should be shown to every student in social science. When an article says something like "people in this category have a *significantly* higher level of X" with an effect size of 0.1 standard deviation, the effect is half as small as the one in the top picture.

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Lionel Page

@page_eco

5 years

When a camera’s framerate is synchronised with the frequency of a guitar’s string vibration, you can visualise the amplitude of the string’s vibration.

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Lionel Page

@page_eco

4 years

Great example of a solution which is easy to understand once known, but hard to discover in the first place.

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Lionel Page

@page_eco

4 years

Brilliant ad for social distancing👇

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Lionel Page

@page_eco

1 year

Our paper on game theory and how professional tennis players serve is now forthcoming at Quantitative Economics! We find that tennis players are really good at playing mixed Nash equilibrium strategies on their serves, but not perfect. 🧵

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Lionel Page

@page_eco

4 years

Mind bending illusion: even when you understand it, you can’t help seeing it.

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Lionel Page

@page_eco

4 years

Brilliant idea to adjust your perception about how you compare to a top athlete like Ronaldo.

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Lionel Page

@page_eco

5 years

Economist: Gamification is a great way to increase motivation. Fitness engineer: Hold my beer.

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Lionel Page

@page_eco

6 years

Animation showing how a boxplot may hide very different data patterns. By @JustinMatejka

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Lionel Page

@page_eco

4 years

Smart design: Ohio State University waited for students’ walking patterns to create footpaths (“desire paths”) and paved them afterwards.

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Lionel Page

@page_eco

10 months

Prospect Theory's famous “S-shaped” value function is a cornerstone of behavioural economics. Surprisingly, more than 40 years after its inception, there seem to be a lot of remaining puzzles about it. Or... perhaps not anymore. A 🧵that may change your view on Prospect Theory.

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Lionel Page

@page_eco

4 years

Very impressive effect of COVID-19 on the "home advantage" in football (soccer). ⚽️ When playing in an empty stadium, the advantage of the home team drops by 50%. 👇Large effects on results, fouls and cards.

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Lionel Page

@page_eco

4 years

Replication by @hoaxeye

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Lionel Page

@page_eco

5 years

Excellent comparison of regression and PCA in a visually pleasing gif. By @andre_quentin , ht @HernanBruno

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Lionel Page

@page_eco

4 years

Not taking any chances.

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Lionel Page

@page_eco

5 years

Fascinating animation shows the evolution of temperature anomalies since 1850. 👉 Global temperatures were stable in the 19th century. They are now on an (accelerating) upward trend. By @RARohde

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Lionel Page

@page_eco

5 years

This visual proof makes this equality so intuitive and easier to remember. by @MagicPi2

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Lionel Page

@page_eco

5 years

This map shows data on tolerance around the world, towards homosexuality (World Value Survey). Among the most tolerant countries: 🇦🇷Argentina 🇦🇺Australia 🇨🇦Canada 🇯🇵Japan 🇳🇱Netherlands 🇳🇿New Zealand 🇳🇴Norway 🇪🇸Spain 🇸🇪Sweden 🇨🇭Switzerland 🇬🇧UK 🇺🇾Uruguay

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Lionel Page

@page_eco

4 years

So cool: 360° photo printed on a sphere.

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Lionel Page

@page_eco

7 years

@SpeakerRyan Ryan praises the US as land of opportunity to all... oh wait it is a myth.

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Lionel Page

@page_eco

6 years

A brilliant visualisation of how the Kolmogorov-Smirnoff test works. Made by @EvaMaeRey

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Lionel Page

@page_eco

4 years

The COVID-19 cases in the USA went from to 100 to 100,000 in 24 days. #StayAtHomeAndStaySafe

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Lionel Page

@page_eco

2 years

How hijacking the human subjective reward system looks like.

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Lionel Page

@page_eco

4 years

Banks take advantage of the fact that nobody reads terms and conditions. A Russian customer took advantage of the fact that not even banks read them.

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Lionel Page

@page_eco

4 years

A great way to realise the sheer quantity of information our 🧠 seamlessly processes when we do a “simple” task like driving a car. This is what the Tesla autopilot sees using a neural network which took 70,000 GPU hours to train. ht @Rainmaker1973

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Lionel Page

@page_eco

5 years

Amazing: a bug in Nature’s code. 🐜🐜🐜 use pheromones to follow trails. If a trail loops, they get locked running in a circle and die from exhaustion. via @Mehdi_Moussaid