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Saved by @tradrdoc

Our intuitions often leads us astray. A good reminder: study counterintuitive math and economic results.

Here are 9 of them 🧵

 The Birthday Paradox

In a room of 23 people, there's a >50% chance that 2 people share the same birthday.

This type of probabilistic thinking does *not* come naturally to many people.
The Coastline Paradox

Fractal geometry is also confounding:

The coastline of a landmass does not have a well-defined measurement. As the unit of measurement gets smaller (eg. from KMs to cm), the length increases without limit.
Winner's Curse

In an auction, the winning bid will usually exceed the intrinsic worth of an item leading to a significant overpay (and negative net profit for the winner).
Braess's Paradox

Removing an extra road can make everyone's commute time faster.

Why? The existence of a "fast" road leads to congestion because everyone uses it. If you remove the shortcut, traffic flows better.
Market for Lemons

If a seller has slightly more info than a buyer (eg used cars), it can lead to market failure:

◻️Buyer will pay price below market (b/c they can't confirm quality)
◻️High-quality sellers leave market b/c can't get good price
◻️Only low-quality sellers remain
The Potato Paradox

If you take 100lbs of potatoes which are 99% water by weight and you let it dry so that they are 98% water, their new weight is 50lbs.
The Pizza Paradox

One 18-inch pizza has more "pizza" than two 12-inch pizzas (still trying to process this fact).
Littlewood's Law of Miracles

An example of the law of large numbers: A person can expect to experience events with odds of one in a million at the rate of about once per month.

(Similarly: in a world with ~8B people, a one-in-billion event will happen 8x a month)
Queuing Paradox

If bank customers take on average 10 minutes to serve and they arrive randomly at a rate of 5.8 per hour...then the waiting time for

◻️one teller is *5 hours*
◻️two tellers is *3 minutes*

Waiting time is reduced by 93x by adding a second teller.
PS. I write interesting threads like this 1-2x a week. Follow @TrungTPhan to catch them in your feed.

Also check out my weekly Saturday newsletter:https://t.co/jGZs8brnVR
Sources

Here's the breakdown of the queueing theory: https://t.co/2vunn5mMTz

Check this awesome article for dozens more counterintuitive math, science + physics facts: https://t.co/8sejjm6AkH
VERY counterintuitive fact: Gabriel's Horn is a geometric figure with:

◻️ *infinite* surface area
◻️ *finite* volume
Deep dive on the Birthday Paradox https://t.co/3AAXUUVGP9

More from Trung Phan 🇨🇦

Trung Phan \U0001f1e8\U0001f1e6
Trung Phan 🇨🇦...
@TrungTPhan
A Netflix user will browse the app for 90 seconds and leave if they find nothing.

Thumbnail artwork is actually NFLX's most effective lever to influence a viewer's choice. A user will look at one for only 1.8 seconds, so NFLX spends huge to optimize them.

Here's a breakdown🧵


1/ Spoiler alert: humans are visual animals.

Our eyes move 3-4x per second to process information and we can analyze an image in as little as 13 milliseconds.


2/ In 2014, Netflix consumer research showed that thumbnail artwork:

◻️ is "the biggest influencer...to watch content"
◻️ is the focus of 82% of browsing time

A user looks at one for only 1.8 seconds. If they can't find Netflix content in 90 seconds, they'll leave the app.


3/ Consequently, Netflix uses an elaborate thumbnail selection process for each of its 200m+ users.

The process is called aestethic visual analysis (AVA), which starts by pulling all the frames from a video.

For reference: a 1hr episode of "Stranger Things" has 86k frames.


4/ In a process known as "Frame Annotation", each frame is tagged with metadata identifying key variables:

◻️ Saliency
◻️ Frame #
◻️ Brightness / Contrast
◻️ Nudity probability
◻️ Face / skin tone
ALL , MARKETING INSIGHTS
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𝚃𝚛𝚞𝚗𝚐 𝙿𝚑𝚊𝚗 🇨🇦...
@TrungTPhan
1/ Marcus Bullock went to prison in the mid-90s at the age of 15.

Today, he's the CEO of Flikshop -- the "Instagram for the Incarcerated", an alternative to the outrageously expensive phone call system.

This is a truly inspirational founder story 👇👇


2/ In 1996, Bullock was living in Maryland. One night, he and a friend carried out an armed carjacking on a man sitting idle in a shopping mall parking lot.

It was the biggest mistake of this life.

3/ Several years prior to hit actions, there was the famed 1989 Central Park "Jogger Case", in which 5 minority youths were (falsely) accused of raping a jogger.

In the aftermath, nearly every state passed new laws that made it easier for courts to try youth as adults.


4/ For the carjacking, Bullock was charged as an adult and served 8 years in prison.

With onerous prison phone charges ($18 / 15 mins), Bullock's mother kept in touch with him by sending a photo or letter every day.

"She saved me," he says of his mom's efforts.


5/ The $1.2B+ prison phone system is dominated by 2 PE-backed firms (Global Tel Link, Securus Tech).

For the right to operate these phones lines, prisons effectively pay kickbacks to state and local government. The highest kickbacks win bids, which drive up costs.
CULTURE
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Trung Phan \U0001f1e8\U0001f1e6
Trung Phan 🇨🇦...
@TrungTPhan
At 40, Jim Simons left a famed math career to launch the most successful hedge fund ever: Renaissance Tech.

Even though it only won 51% of trades, the fund made 66%/yr for 30yrs (Simons worth = $25B). It's a story of genius, but also of how hard it is to beat markets.

THREAD🧵


1/ The crown jewel of RenTech is The Medallion Fund (launched in 1988).

◻️ From 1988-2018, it posted a return of 66%/yr (39% after fees)
◻️$1 invested in 1988 is now worth $14m+
◻️ Cumulative profit = $100B+ even with an avg. fund size of only $4.5B


2/ Before creating what Bloomberg calls the “greatest money-making machine ever”, Simons was a legendary mathematician.


3/ While at Stony Brook, Simons started trading commodities (with money staked by former MIT classmates).

The side investing was good enough that Simons -- also going through a divorce -- decided to leave academia and launch his own money management firm in 1978: Monemetrics.

4/ At the time, there were 2 main investment approaches:

◻️ Fundamental (understanding and forecasting an asset based on key drivers)
◻️ Technical analysis (studying price charts)

Simons’ strategy was to place a “fundamental lens” on currencies (eg. supply and demand).
ALL
Trung Phan \U0001f1e8\U0001f1e6
Trung Phan 🇨🇦...
@TrungTPhan
“I spend too much at Starbucks” is a legendary meme.

It's also not an accident: the coffee retailer -- worth $120B -- uses many psychological hacks in its store and menu designs to get you to drop more cash.

Here are 11 of them 🧵


1/ Starbucks is all about positioning

The chain has higher prices vs competitors. But that's the point.

People typically assign higher value/quality to higher prices. Known as "irrational value assessment", this makes Starbucks an everyday luxury that people will pay for.


2/ Premium brand = premium customer base

By setting its prices higher, Starbucks attracts clientele that are relatively price insensitive.

Starbucks frequently raises its prices with little negative effect to its bottom line.


3/ "More than coffee"

Former Starbucks CEO Howard Schultz created the premium feel by emphasizing experience:

◻️Positioned SBUX as a "third place" (b/t home, work)
◻️Brought bean grinding in-store (for aroma)
◻️Banned auto espresso machines (it took away from the barista craft)


4/ Lighting and visual cues

The Starbucks operations is about "flow", efficiently moving people around the store+ getting them to spend.

To form lines, it directs people to well-lit areas (usually the merchandise, which provides the added benefit of nudging products for sale).
BUSINESS MENTAL MODELS
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𝚃𝚛𝚞𝚗𝚐 𝙿𝚑𝚊𝚗 🇨🇦...
@TrungTPhan
1/ Amazon is famous for its writing culture:

• "Mock press releases / FAQs" for new product pitches
• "6-page memos" instead of Powerpoint

Two former Amazon execs wrote a book called "Working Backwards" detailing the philosophy.

Here are some insights 🧵


2/ The "Working Backwards" playbook

Instead of creating a product then finding customers, Amazon asks "What does the customer need?" and works toward the product.

✅Customer need --> Create product
❌Create product --> Find customer

3/ Write a mock press release

To determine if the customer need makes biz sense, employees write a press release:

• What problem is the new product solving
• Why it's better than existing options

To persuade a customer, the document has to be jargon-free and tell a story.


4/ Press release forces big thinking

You don't write a press release for an incremental improvements.

Creating a product worthy of a press release means really solving a customer problem and going after markets with large TAMs.

5/ Include an FAQ in press release

Addressing every potential customer question can help identify hurdles to getting something to market...and also uncover opportunities.
CULTURE

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Patrick McKenzie
Patrick McKenzie
@patio11
The payments wars in Japan are heating up and one of the battlegrounds is convenience store coffee.

“Coffee? What does that have to do with payments?” I’m glad you asked.

Convenience stores are low net margin businesses, which sell some high gross margin goods/services but a lot of low ones, and have high fixed costs and a low ticket size. The typical transaction is under 500 yen ($5) and many are about $1.

They need repeat custom.

A few years ago, all of the chains had a good idea for increasing frequency of use: make a minor capital investment in automatic coffee machines. Sell access to them for the price of a cup / ice; customers self-serve with the machine.

The price point is $1 to about $2.

Coffee quickly became one of the most frequently repurchased items at convenience stores, in no small part because it’s the one thing they can sell which is phameceutically habit forming but totally unregulated. (Just telling it like it is.)

But the coffee is not very defensible

The problem, such that it is, is that competing chains are everywhere and *all* of them serve Thoroughly Adequate Coffee at similar prices, so you’re back into the brutal economics of “Who is 3 meters closer to 40 customers at 1 office?”

Enter payment apps.
FINANCE
Dave Nemetz
Dave Nemetz
@davenemetz
1/ A lot of people ask me how Bleacher Report found our first writers when we were tiny and had no funding.

So here's a thread on all the things we tried, what worked best, and lessons on growing a community from scratch:

2/ When we first started B/R, all the articles were written by my co-founders, our friends, and me.

This led to some hilariously bad takes. Like this article where I panned the SF Giants for drafting future World Series MVP Madison Bumgarner.

3/ When we were ready to start building our community, we started with word of mouth. We drafted an email pitching our concept. It went out to everyone we knew, asking them to share it with anyone who would be interested.

This got us maybe a few dozen signups.

From the email:


4/ With only a handful of members, we needed to make the community feel more active.

So we faked it til we made it.

Our team created multiple accounts and posted using different fake names. This created the sense of more activity and encouraged new members to join in.

5/ Later, I learned that the founders of Reddit did the same thing early on.

Sometimes the solution to the "chicken and the egg" problem of building community is to create the illusion of more chickens (or
CULTURE , FINANCE
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10-K Diver
10-K Diver
@10kdiver
1/

Get a cup of coffee.

In this thread, we'll cover *State Quantities* and *Flow Quantities*.

This mental model can help us analyze many different entities -- from complex engineering systems to publicly traded companies.


2/

A "State Quantity" is something that's associated with a *specific point in time*.

For example, the number of followers a Twitter account has is a state quantity. This number can go up and down over time. But at any one *specific* time point, it's fixed.

3/

Similarly, the amount of cash a company has is a state quantity.

This cash balance can also rise and fall over time.

But pick any one *specific* time point -- and the company can only have one *specific* cash balance at that time point.

4/

By contrast, a "Flow Quantity" is something that's associated with a time *interval* rather than a time *point*.

For example, the number of followers gained by a Twitter account is a flow quantity. It's meaningful only when we specify a time interval (eg, the last 30 days).

5/

A simple analogy is that a State Quantity is like a photo -- a snapshot at a particular *point* in time.

But a Flow Quantity is like a video -- a record of events that take place during a particular time *interval*.
SCIENCE , FINANCE
\u0645\u0627\u0633\u0679\u0631 \u0645\u0627\u0626\u0646\u0688
ماسٹر مائنڈ...
@I_M_Imrann
*GOOD NEWS*                 
1. According to latest World  Bank ranking in Ease of Doing Business, Pakistan’s ranking in this indicator has improved from 130 to 72 and is placed at 2nd position in South Asian countries in terms of Ease of Starting a Business, after 30 years.

2. Karachi circular railway restored, after 20 years.
3. Payment dues to Steel Mills employees paid, after7 years.
4. Re-activation of textile industry in Pakistan, after 13 years.
5. Pakistan has been put on an Export Led Growth  rather the previous import led growth strategy

and has registered an increase in exports, after 8 years.
6. Current account surplus, after 20 years.
7- Pakistan's exports to UK top $1 billion ( $1.2 billion) in first six months of fiscal year, after 74 years.
8. Lifafa journalism exposed ,after 30 years.

9. India exposed on Kashmir internationally, after 30 years.
10. Pakistan saved from paying $1.2bn penalty as Karkey dispute 'amicably solved, after 7 years.
11. Indian Propaganda Network smashed through  EU ( Info - lab ) Indian Chronicles, after 74 years.

12- Pakistan has been named the top holiday destination for travellers for the year 2020 by the United States-based luxury and lifestyle publication Conde Nast Traveler, after 74 years.
The listing follows several positive reviews of the tourist attractions in the country by
FINANCE
Ming Zhao
Ming Zhao
@FabiusMercurius
Day in the Life of a Hedge Fund Analyst

Few live to tell the tale.

"Was it like Billions?"
"Describe ur investment process?"
"What did u learn?"

I get these questions all the time, but for a while I was afraid of answering publicly. No more!

Hedge fund story time.
👇
🧵/

1/ ⏰ 6AM Pre-Market Review

Wake up thinking about ur overnight positions.
What happened during London/Asia trading?
Scan the major news on ur way to office.
🏢🚕🚶‍♀️

Think about how ur getting screwed by beta (general macro, FOMC, inflation, etc.) cuz ur net long (or net short).

2/ 7AM Portfolio Review

U'll typically have ~250 names in the portfolio "universe" (stocks w/ active positions & those on watchlist but already modeled).

Review each thesis vis-a-vis new market conditions. Anything changed?
Should u downside/upsize any?
New trade opportunities?

Here's a checklist of top items to check per company:

- Any earnings calls this week?
- Any product releases?
- Any new sell-side reports? Downgrades/Upgrades?
- Any M&A rumors in the space?
- Any management change announcements?
- Any guidance revisions?
- Any legal happenings?

3/ 8AM Plan out your daily/weekly agenda

Major types of events that'll populate ur calendar:
- Investor day at XYZ
- Q1-Q4 earnings call
- XYZ road show
- Dinner event w/ IR (investor relations) at XYZ
- Private buy-side bus trip (w/ mgmt @ XYZ) arranged by GS
- JPM conference
FINANCE , ALL

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SRI MOOKAMBIKA DEVI, KOLLUR (KAR)

There was an Asura, Kaumasura, who was doing penance to please Shiva and get a boon. To prevent him from asking for a boon, Devi Saraswati made him dumb (hence called Mookasur)
Later, Adi Parashakti slayed him and came to be called Mookambika.


It is said that Adi Shankaracharya had a vision in which Devi agreed to follow him provided he did not look back. He kept walking and was assured of her presence due to the sound of anklets. When he reached here in Kollur, he turned back as the sound of anklets had stopped.


So Devi stayed here and merged with the lingam. The place came to be called Mookambika Kshetram.
The linga has integrated on it’s left side MahaKali, Maha Lakshmi and Maha Saraswathi and on the right side- Brahma, Vishnu and Shiva.


A swarna rekha (gold line) divides this linga into left and right portion. Adi Shakthi in this Udhbhavlinga form appears only here.
Devi sits in padmasana and has 4 hands.
Adi Shankaracharya installed the Sri Chakra in front of Devi and also composed the Soundarya Lahiri here.
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THREAD: Meditations on marriage metaphors in Ruth

The book of Ruth is, of course, a story about a beautiful marriage. But even before the courtship and the wedding and the important genealogy at the end, we find interesting language that is strikingly reminiscent of Genesis 2:24


That important verse reads:

'Therefore a man shall leave [יַֽעֲזָב] his father and his mother and hold fast [וְדָבַ֣ק] to his wife, and they shall become one flesh.'

The verb עזב can be quite strong in force. For example, Joseph leaves behind [וַיַּעֲזֹ֤ב] his garment as he flees from Pharaoh's wife's sexual advances. Countless times, Israel is depicted abandoning the LORD, for example in Judg 2:12 [וַיַּעַזְב֞וּ], and going after other gods.

Likewise, the verb דבק is rather striking. Lot is mortified of disaster overtaking him [תִּדְבָּקַ֥נִי] as he flees from Sodom. Israel is commanded in Deut 10:20 to cling fast [תִדְבָּ֔ק] to the LORD and serve him and swear by his name.

Together they illustrate how radical God designed marriage to be. Marriage is a real severing of family relations in order to form a new, permanent bond with another human being.

Something very similar to this takes places in Ruth's life.
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antifa.drone
@antifa_drone
Fake chats claiming to be from the Irish African community are being disseminated by the far right in order to suggest that violence is imminent from #BLM supporters. This is straight out of the QAnon and Proud Boys playbook. Spread the word. Protest safely. #georgenkencho


There is co-ordination across the far right in Ireland now to stir both left and right in the hopes of creating a race war. Think critically! Fascists see the tragic killing of #georgenkencho, the grief of his community and pending investigation as a flashpoint for action.


Across Telegram, Twitter and Facebook disinformation is being peddled on the back of these tragic events. From false photographs to the tactics ofwhite supremacy, the far right is clumsily trying to drive hate against minority groups and figureheads.


Declan Ganley’s Burkean group and the incel wing of National Party (Gearóid Murphy, Mick O’Keeffe & Co.) as well as all the usuals are concerted in their efforts to demonstrate their white supremacist cred. The quiet parts are today being said out loud.


The best thing you can do is challenge disinformation and report posts where engagement isn’t appropriate. Many of these are blatantly racist posts designed to drive recruitment to NP and other Nationalist groups. By all means protest but stay safe.
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Peter McCormack [Jan/3\u279e\u20bf \U0001f511\u220e]
Peter McCormack [Jan/3...
@PeterMcCormack
1/ So here is a thread on how I turned $32,000 into $1.2m and back to pretty much zero (once taxes are paid).

Just note, I am not bitter or salty in any way at all, the last 2 years have been an amazing ride - travelled the world, been wealthy, been poor.

2/ Dec '16, my advertising agency folded, I had a little bit of money left and I put $32k into Bitcoin and Ether. As it started to go up I diversified into everything, Monero, Dash, this that, any crap - even Ripplecoin. Everything just kept going up.

3/ By March I think I had around $300k and $500k by the summer. I used to take 25% out but towards the end of the summer I got greedy and put it all back in and by December it was $1.2m.

4/ Thinking I was an absolute genius I decided to start a bunch of businesses. As silly as it sounds I had this goal of making $5m as I wanted to buy Bedford Town Football Club and get them in the league, and as Crypto was going up forever I needed 6 months.

5/ So:
- Trading (income 1)
- Podcast (income 2)
- Mining (income 3)
- Mining pool (income 4)
- Consulting (income 5)

Yes - all of the above as a one-man army :)
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