SKU: 15126087652

The Great Mental Models: Systems and Mathematics

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The Great Mental Models: Systems and MathematicsBy: Shane Parrish, Rhiannon Beaubien, Rosie Leizrowice Time and time again, great thinkers like Warren Buffett and Charlie Munger have credited their success to mental models: simple representations of how the world works that can be applied in a wide array of contexts. Mastering a small number of these concepts enables you to rapidly grasp new information, identify patterns others dont, and better anticipate outcomes. The Great Mental Models

By: Shane Parrish, Rhiannon Beaubien, Rosie Leizrowice     

Time and time again, great thinkers like Warren Buffett and Charlie Munger have credited their success to mental models: simple representations of how the world works that can be applied in a wide array of contexts. Mastering a small number of these concepts enables you to rapidly grasp new information, identify patterns others don’t, and better anticipate outcomes.

The Great Mental Models introduces the most powerful models that anyone can use right away to improve decision making and productivity. In this volume, Shane Parrish introduces simple frameworks borrowed from mathematical and systems thinking, including:

  • Regression to the mean: Over or underperformance over time tends to balance out to the average.
  • Margin of safety: To create a robust system, design for the most extreme possible scenario to avoid catastrophe if it does arise.
  • The law of diminishing returns: The return on any investment, whether money, time or attention, tends to reduce with each additional unit.

Building a latticework of mental models is one of the most powerful things you can do to become a better thinker, leader, or creator. The Great Mental Models is the accessible guide you need to unlock this ability.

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SKU: 15126087652

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4.7 ★★★★★
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Rachel
Phoenix, US
★★★★★ 4
Not so tough
Size: Mini, Color: Gator (Pink)
I bought this because I dog sit. The dog chews up every. Single. Toy. So I bought it since it was cheap and it can be in the “chunk” (the dog’s name) toy box. It is not durable at all. He tore it up just as fast as a cheaply made toy. Chunk LOVES it! He would not stop playing with it. He loves the squeakers, it is a perfect size for him to throw it up in the air and chase it, and he loved ripping the legs off. It is good for my husband and I because there is little to no fluff. However, it is the perfect size to drop behind the couch and not be able to get. So once he drops it behind the couch, he won’t get it until morning. Now for my dog’s rating. My dog loves this toy too. He is much more gentle with toys (he has $5 Walmart toys we bought him back in 2020 in perfect condition that he plays with them every day). Before Chunk came over for the weekend, my dog Ted played with this. Ted is a larger small dog and chunk is a smaller small dog. And it is still the perfect size for both dogs.
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Reviewed in the United States on April 26, 2026
S
Verified Purchase
Scott T
Boise, US
★★★★★ 5
Tough
Size: Large, Color: Dinos Frills (Pink)
Tough dog toy that's held up through multiple washes! My dogs love the squeaker. They are not destructive chewers so I can't really say how it would hold up with that kind of dog though.
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Reviewed in the United States on June 8, 2026
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Verified Purchase
ocd_reader
Chelsea, US
★★★★★ 5
Cute and well made my dogs love it.
Size: Mini, Color: Gator (Pink)
Cute little toy definatly for small toy sized dogs. This toy is bright and colorful and well made. My little dog likes it very much and tosses it around all the time. Great toy for fetch.
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Reviewed in the United States on May 5, 2026
M
Verified Purchase
MW
Houston, US
★★★★★ 1
Squeaker inside toy breaks after 2 days
Size: Mini, Color: Gator (Pink)
Bought for my 8 lb chihuahua for Christmas. I have 3 little girls. The youngest loves her toys and of course she took this one over immediately. She just loved everything about it. The material on the gator is amazingly durable and I believe would hold up for a good while. The squeaker inside the toy however, broke after 2 days of my girl playing with it. It's now a noiseless toy that she does not like too much as it does not squeak because it only had the one squeaker in it. I would recommend that 2 squeakers be inserted into this gator. I would not purchase again due to the longevity of the squeaker...only lasted 2 days.
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Reviewed in the United States on January 5, 2026
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Verified Purchase
Celeste A
Boise, US
★★★★★ 5
Go dog toys are the best!
Size: Large, Color: Dinos Frills (Pink)
These are the only stuffed toys I buy for my Pittie because they are so well made. Even when she unstuffs them, she plays with them forever!
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Reviewed in the United States on May 16, 2026

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