BC FINANCE
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 🇨🇦

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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
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 \U0001f1e8\U0001f1e6
Trung Phan 🇨🇦...
@TrungTPhan
For decades, Jeff Bezos shunned ads.

But now, Amazon’s ad business is huge: it’s on a $30B+ annual run rate (more than 2x the combined sales of Twitter, Snap and Pinterest).

Here’s how it happened 🧵


1/ Amazon doesn’t break out its ad business separately in financial filings. However, most analyst believe ads make up the majority of its “Other” revenue segment.

This figure has exploded from $1B in 2015 to a current annual run rate of ~$32B.


2/ In 2009, Bezos said “ads are the price you pay for a crappy product”.

But the business is so lucrative that Amazon’s interface has been swamped with ads:

◻️ First 3-7 search results (left in red)
◻️ Most of the product page (right in blue)


3/ Prior to the rise of ads, Amazon set out to build the ultimate organic customer recommendations engine.

The approach was codified in a famed 2003 research paper: “Amazon Recommendations: Item-to-Item Collaborative Filtering.”


4/ In recent years, Amazon organic recommendations:

◻️"Customers who bought this also bought this"
◻️"Customers who viewed also viewed"

Have been replaced w/ ads:

◻️ "Sponsored products related to"
◻️ "Brands related to this category"
TECH
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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
Trung Phan \U0001f1e8\U0001f1e6
Trung Phan 🇨🇦...
@TrungTPhan
The most memorable interview I did this year was w/ Stanley Druckenmiller, who famously made $1B shorting the British Pound.

The trading legend's track record includes a 30-year stretch returning 30%+ a year (without a single down year).

Here are 8 investing lessons🧵

1/ Make concentrated bets in high conviction plays


2/ Concentrated bets can sometimes *reduce* risk


3/ Use a multi-disciplinary approach to investing


4/ Know when to sell (he never uses a stop loss)
FINANCE

More from Finance

Investment Books
Investment Books
@InvestmentBook1
Thread Best books recommendation by one of best investor I knew @insharebazaar (Virtually)

He grab many multibagger stocks and His style also unique(1st Seen interview in @TraderHarneet's YT Channel)

He follow Simple process

Young Intelligent Investor who also appeared in ET

1. One Up On Wall Street

2. Rich Dad Poor Dad

Access here : https://t.co/UWOCF732z6


3. The Unusual Billionaires

4. Trading in the Zone

https://t.co/G7mqVPtEM0


5. Market Wizards

6. The Intelligent Investor

https://t.co/yPKBzYyPAl


7. The Five Rules for Successful Stock Investing

8. Reminiscences of a Stock Operator

https://t.co/PiioB3hdHP
FINANCE
Shaan Puri
Shaan Puri
@ShaanVP
If you're a college student who wants to pay off all your loans... here's an idea for you:

It takes ~$5k to start and will make ~$30k a year of profit

It won't get you rich, it'll pay for college.

(..and will teach them more about business than they’ll learn in school)

The idea isn’t sexy. But it works:

**Plastic Moving Bin Rentals**

Everyone knows moving sucks. The worst part is being stuck with 400 cardboard boxes at the end of your move.

Instead - @benmlevy told me about Gorilla Bins. They dropoff plastic moving bins, & pickem up later.


Let’s break it down. Our goal is to pay for college (~$30k profit per year).

To do that, I think we’ll need $50k in revenue.

The avg move (a 2 bedroom apartment) is $180

To hit our goal, we need do ~5.5 moves per week

COSTS?

How many bins do we need to buy up front?

5.5 moves a week x 50 bins = you need 275 bins. Let’s round up to 300 to be safe.

Ok let’s hop over to @uline to see how much these bins cost

Bingo. Bins cost about $15 a piece.

$15 x 300 bins = $4,500 initial startup costs.

Time to beg your parents or a rich aunt to lend you money to get the biz rolling (...or just take $5k of student loan money and invest it here…)
FINANCE
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The Profitabull | Invest Better | Think Better
The Profitabull | Inve...
@theprofitabull
It's been more than 60 years since Philip Fisher wrote the investment classic in "Common Stocks & Uncommon Profits".

The book is famous for the 15 questions which one must ask before investing in any company.

THREAD


These are the questions which help us in determining the "quality" of a business.

Warren Buffett has time and again said that he is 85% Graham and 15% Fisher.

Let's have a look at these 15 questions.

P.S.: Stocks listed in this thread are not to be taken as recos.

1. Does the company have products or services with sufficient market potential to make possible a sizable increase in sales for at least several years?

The important point which you must note here is that you must not just look at the size of the company.

You must also look at the opportunity size of the market in which the company exists.

Let's take the case of HDFC Bank. Although it is a huge bank, but it controls just 9% of the total credit market in India, suggesting an enormous opportunity for it to capture.

2. Does the management have a determination to continue to develop products or processes that will still further increase total sales potentials when the growth potentials of currently attractive product lines have largely been exploited?
FINANCE
SG
SG
@GhoshSubhag
Way to #Financial freedom

1) Rule of 72 (Double Your Money)
2) Rule of 114 (Triple)
3) Rule of 144 (Quadruple)
4) Rule of 70 (Inflation)
5) 4% Withdrawal Rule
6) 100 - Minus Age Rule
7) 10, 5, 3 Rule
8) 50-30-20 Rule
9) 3X Emergency Rule
10) 40% EMI Rule
11) Life Insurance Rule

1) Rule of 72
No. of yrs required to double your money at a given rate, U just divide 72 by interest rate
Eg, if U want to know how long it will take to double your money at 8% interest, divide 72 by 8 and get 9 yrs

At 6% rate, it will take 12 yrs
At 9% rate, it will take 8 yrs

3) Rule of 144

No. of years required to, quadruple your money at a given rate, U just divide 144 by interest rate.

For eg, if U want to know how long it will take to quadruple your money at 12% interest, divide 144 by 12 and get 12 yrs

At a 6% interest rate, it will take 24yrs

4) Rule of 70

Divide 70 by the current inflation rate to know how fast the value of your investment will get reduced to half its present value.

The inflation rate of 7% will reduce the value of your money to half in 10 years.

5) 4% Rule for Financial Freedom

Corpus Reqd- 25*Annual Expenses

Eg- the annual expense is 500,000 then the corpus required to retire is 1.25 cr.

Put 50% into fixed income & 50% into equity.

Withdraw 4% every yr, i.e.5 lac.

This rule works for 96% of the time in 30 yr period
FINANCE
Prashant Shah
Prashant Shah
@Prashantshah267
Thread: Central Pivot Range (CPR)

CPR is another popular tool. Three lines are plotted on the chart when we plot CPR.

The three lines are: CPR, TC and BC.

Let’s understand the calculation.


You may recall that I explained the calculation of Pivot levels in an earlier thread. CPR stands for Central Pivot Range. It is always a center line of the three lines that gets plotted in the chart.

CPR is a Pivot price. Pivot is average of HLC as explained in the prev thread.


We also discussed about Mid-range of the session. Mid-range is average of High and low price of the session.

The mid-range of the bar is known as BC in the CPR calculation. BC stands for Bottom central pivot.


Pivot level captures the relationship of the closing price to the range of the session.

Pivot price above mid-price = bullish pivot
Pivot price below mid-price = bearish pivot


So, CPR line is Pivot and BC line is Mid-range.

What is the difference between both?
Mid-range is average of High and Low.

Pivot is average of High, Low and Close.
What will make the difference between the two?

Close.
FINANCE , LEARNING

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So when it first appeared in Normandy, the Sherman Firefly and it's meaty 17 pounder represented an ideal combo of reliable chassis, great gun and devastating firepower right?

Ummm...

Truth is a bit more complex. /1
#WW2 #SWW #History


Deliveries of Firefly to units only commenced in April 1944,
just a few weeks before Overlord & left minimal time for familiarisation.

Armoured Regiments mostly utilised Fireflies on a basis of 1 per troop of 4 tanks. /2


Finally each armoured regiment troop had access to integral, meaty, anti-tank firepower capable of dealing serious damage to any German AFV likely to be encountered. /3


The dual purpose 75mm gun was quite capable of laying down a reasonable HE shell or AP round for dealing with Panzer III or IV.

Firefly's 17 Pounder had.... problems with HE, but excelled at tank killing. So Tigers and Panthers would need to be wary. /4


Firefly's design history dated back to March 1943 when the General Staff published "Policy on Tanks" which effectively stated the majority of tanks should have a good HE weapon and...

[See image below] /5
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Statue of Equality (Ramanuja) Muchintal, Hyderabad, Telangana

The Statue of Equality is a monument in India dedicated to the 11th-century Vaishnavaite Sage Bhagavad Ramanuja, commemorating 1000 years since his birth. It was inaugurated by Prime Minister Narendra Modi ji in 2019.


In 2014, Sri Chinna Jeeyar came up with the idea to commemorate the 1000th anniversary of Sri Ramanuja's teachings by building the Statue of Equality. The statue is constructed on an estimated 34 acres in Hyderabad, India.


It consists of a 216 foot tall statue of Ramanuja and is surrounded by 108 Divyadesams (model temples) and includes an educational gallery. The project budget is 1000 crore rupees.The foundation stone for the Statue of Equality was laid by Chinna Jeeyar.


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The temple is located on the 27,870 square metre second floor with a 120 kg statue of Ramanuja, representing the years he lived, meant for daily worship. The 1,365 square metre third floor including a Vedic digital library and research center.
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Sam
Sam
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This day was inevitable. Indian Muslims always lived in La La Land. They bad mouthed real well wishers & slept with the enemy who never considered them as part of them. In Gulf, Indian Muslims were busy with Javed Akhtar & Sonu Nigam. Never interacted with South Asian diaspora

Now when Indian Muslims are thrown to wolves it’s Pakistani & Bangladeshi Muslims with whom they kept distance are the only ones feeling their pain. None of the people who they invited for Eid Milan. Qawali & Mushaira are there for them. Such people invoke wrath upon themselves

Indian Muslims never spoke for Kashmiri Muslims. Distancing from separatist was understandable but we never even bothered to highlight their human rights violation & rapes carried out by forces. We could have sent them humanitarian help we didn’t. Our silence made us complicit.

When Sania Mirza married Shoaib Malik it was something legal. A Muslim married another Muslim. Entire Hindutva media went after her. They launched a witch-hunt for months. No Indian Muslim stood by her. All were silent. Now days come when Muslims are arrested for marrying a Hindu

Indian Muslims particularly the elite downplayed communalism in India by saying it will pass or Hindu majority is good. Fringe are bad. They misguiding others. Muslims were always others. Indians were happy to see Muslims sing & dance & eat their food but never considered as own
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Michael King \U0001f1fa\U0001f1f8
Michael King 🇺🇸...
@8MichaelKing
Ever notice how the top niches are centered around health, wealth, and relationships?

There's a deep-rooted psychological (and biological) reason why.

And today, I'm gonna to explain all of it so you can start profiting off of this knowledge 💰💰

*Now, this thread is going to be long and in depth. Make sure to favorite the top tweet now so you can come back to it later.

So. Down to the very core of every living being (humans, dolphins, bacteria, aliens), there are only two drivers:
1. To survive
2. To reproduce

Right off the bat, we know that sex is a primary driver to human behavior.

This would also mean that each gender has its own insecurities regarding sex.

Men have a subconscious fear that their woman will leave them for someone more successful

Women have a fear that their man will leave them for someone younger & better-looking

We can conclude that men are attracted to looks, and women are attracted to status.

This is human nature down to its very core.

Crazy, blue-haired feminists will try to argue and say otherwise.

But, 50 years of feminism DOES NOT OVERRIDE millions of years of evolutionary biology.

Here's a quick visualization exercise so you can see how true all this is...
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Jaya_Upadhyaya
Jaya_Upadhyaya
@Jayalko1
AHOBILAM NARASIMHA SWAMY KSHETRAM: KURNOOL (AP)
#andhratemples

Ahobilam is the place where Prabhu appears in his fierce form, called Ugra Narasimha, who is Svayambhu (self-manifest).
Ahobilam is one of the 108 Divya Desams. It has 9 shrines for different forms of Narsimha.


Ahobilam was the exact place where Sri Narasimha appeared and tore apart Hiranyakashipu to save Prahlad. At that moment, all the Devas appeared and praised him as Ahobala (Aho is mighty and bala is strength). So the place came to be called Ahobilam.


Out of the 9 shrines, most famous is the Ahobila Narasimha Swamy where Prabhu is seen as Ugra Narasimha.
In another shrine, Prabhu appears as Malola Narasimha Swamy. Malola means beloved of Lakshmi. Here Prabhu is in peaceful mudra with his consort Ma ChenchuLakshmi.


Jwala Narasimha Swamy shrine is the actual spot where the fierce anger of Prabhu reached its culmination when he tore Hiranyakasipu.

Ugra Stambham is the pillar from which Narasimha appeared with such force that the entire hill split into two.
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