"I could calculate the motions of the heavenly bodies, but not the madness of the people." - Newton
Newton's Financial Misadventures in the South Sea Bubble
11–16 of 16 posts
Re: Newton's Financial Misadventures in the South Sea Bubble
#12Earlier quoted context omitted.
As a fan of financial history -- and I know that's an odd thing to be interested in -- this is the craziest story I've ever heard.
Financial/economic history is incredibly important if one wants to invest successfully. Much of the things we see in the markets had happened before, but not necessarily in our lifetimes. For example there were entire decades in the US history when bonds easily outperformed stocks, yet because of the last decade your typical retail investor thinks bonds are for people that don't want good long term gains. "How The Ec…
It's not just the last decade. Since the mid-1980s the conventional wisdom has been that stocks > bonds for long term gain.
Re: Newton's Financial Misadventures in the South Sea Bubble
#13The awesome folks at Extra Credit History did a great series on this: https://www.youtube.com/watch?v=k1kndKWJKB8
As a fan of financial history -- and I know that's an odd thing to be interested in -- this is the craziest story I've ever heard.
The Mississippi Bubble came first, don't you know?
https://rose.ai/dashboard/daily.observations.20190918.the.mi...
Re: Newton's Financial Misadventures in the South Sea Bubble
#14https://en.wikipedia.org/wiki/Dunning–Kruger_effect Newton got hit hard by this I think. I’m also always reminded of Rainman trying to predict the Wonder Wheel in Vegas and not realizing it plays by very different rules than blackjack, where you can count the cards and make predictions.
The first rule of the Dunning–Kruger club is that you don't know you're in the Dunning–Kruger club. Depending on the topic, even the most intelligent of us can get tangled up
The second rule is that if you think you're in the club, you probably aren't. The third row is that if you only think you're in the club to lessen your chances of being in the club, you're more likely than someone who doesn't even know about the club to be in the club.
Re: Newton's Financial Misadventures in the South Sea Bubble
#15The awesome folks at Extra Credit History did a great series on this: https://www.youtube.com/watch?v=k1kndKWJKB8
As a fan of financial history -- and I know that's an odd thing to be interested in -- this is the craziest story I've ever heard.
See also Tulip Mania: "the first recorded speculative bubble"
Re: Newton's Financial Misadventures in the South Sea Bubble
#16https://en.wikipedia.org/wiki/Dunning–Kruger_effect Newton got hit hard by this I think. I’m also always reminded of Rainman trying to predict the Wonder Wheel in Vegas and not realizing it plays by very different rules than blackjack, where you can count the cards and make predictions.
What people think of Dunning-Kruger is almost never the same as what it is.
The Dunning-Kruger hypothesis is that non-experts are (as a whole) not good at estimating their performance. This does not mean that they think that they are good, just that they think they are better than they are. They still tend to rate themselves as worse than an expert would rate themselves.
My favourite explanation for this effect is not that people are bad at estimating their own performance, but that they are bad at estimating the range of performance of the population. They scale and shift their performance into a range they think is reasonable.
Imagine a hypothetical test that uniformly scores a population from 0-100; everyone is spread out evenly across the range of scores. The average and median are both 50, and the same number of people get 32 as get 95, and every other score as well.
Now imagine everybody is absolutely accurate at picking their own ranking on this test out of the population.
Take two people, one who knows they are exactly average at this test, better than 50% of people; and one who is an expert, better than 90% of people. Based on the set up we know that these people will score 50 and 90.
Now we 'scale and shift' the score axis.
Say for example, that both people assume that the range of test scores will be between 40 and 90; the worst performer will get 40, and the best will get 90. Under this assumption the two people will predict their scores as 65 (vs 40, +25 over actual!!) and 85 (vs 90, -5 under actual!!) respectively.
The worse performer grossly overestimated their performance, and the expert mildly underestimated their performance, even though both knew perfectly what their relative performance was.
This shows that your estimation of your performance on a test can be wildly skewed by incorrectly estimating what the range of scores will be.