Episode 157: Robin Hanson discusses prediction markets
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What exactly is a prediction market and how does it work?
Yeah. No one.
Hello and welcome to Elucidations, an unexpected philosophy podcast. I'm Matt Tykeman. I'm Joseph. And with us today is Robin Hansen, Associate Professor of Economics at George Mason University, co-host of the Minds Almost Meeting Podcast. and author of The Age of M and the Elephant in the Brain. And he is here to talk about prediction markets.
Thanks for having me.
So the main topic that you've worked on in this area is what sometimes gets called prediction markets. I thought maybe we could open just by explaining in really general terms like what a prediction market is.
Sure. So you start with a bet, like, you know, will a horse win the race? But let's pick something more practical. Will you make a deadline on a project? And you could just bet with somebody about that, you know, ten dollars each, and then if I'm right, I get ten dollars from you. If you're right, you get ten dollars from me, that's a bet. But we can turn that into an asset. We could write a piece of paper that said pays ten dollars if The project makes the deadline. And then we could buy and sell that piece of paper. You know, and the price might fluctuate. And that would be a betting market. A place where people buy and sell bets. And that's what we're basically talking about when we're talking about prediction markets.
We're talking about betting markets. And the whole idea is that the price in a betting market is informative about the event. If people are trading this asset that pays $10 if we make the deadline, and the current price is $6, that suggests a 60% chance. Chance that we will make the deadline. And you might not know that. Maybe as head of the project you would find that informative, to know that you have a forty percent chance of failing.
What exactly is the difference between the bet working as sort of this like office pool where everybody puts in money and then uh they collect from the general pot if they win, versus this thing where there's an asset that people invest in?
So people often bet, as you say, in pools, paramutual pools, and that's hey how it works at the horse races. And in a paramutual pool there's different pools. There's the pool where the horse comes in first, or second, or third, say, or it doesn't do as well. And you put your own money into part of one of the pools, and then the rule is the winners of the pool get to divide up the other pools in proportion to how much money they put into the winning pool. So if, you know, a hundred thousand dollars went into all the pools and twenty thousand dollars went into your pool That's a ratio of five to one. So if you put in ten dollars into your pool, then you'll get fifty dollars Total because you get that fraction of all the other pools.
So paramutual pools are a way to bet and they do aggregate information, but they don't do as good a job of a betting market. So what happens in a paramutual pool is people will be adding to the pool and they'll show on the board how much money is in each pool, but you are well advised to wait till the last possible moment. P decide which money to put your pool in because that's the moment at which there's the most information about the current odds. Because you might put your money early on thinking there's not many people in your pool and then that's a good investment, but later before the doors close, lots of people put money into your pool, and then you don't actually get very good odds. And maybe that wasn't a good bet for you at those odds.
So when you bet, you want to know what odds you're going to bet at to decide whether you think it's a good bet. And in a paramutual pool, you only know the odds if you bet at the last possible moment. But in the betting market When you make a purchase, you know the price of the purchase at the moment you make the purchase, and you can decide, do I want to make this purchase? Buy or sale? Mm. Based on the price you see at that moment. And then because the prices fluctuate, now information is collected. So the key idea of a betting market is that prices fluctuate up and down.
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Chapters
8 chapters
1
What exactly is a prediction market and how does it work?
0:12–6:39
2
How do prediction markets turn bets into informative price signals?
6:39–12:32
3
Why are prediction markets considered more accurate than polls or expert panels?
12:32–20:08
4
What are decision markets and how can they be used for corporate governance?
20:08–25:36
5
How can futarchy replace traditional legislative decision‑making?
25:36–30:48
6
What legal and practical obstacles limit the adoption of prediction markets?
30:48–36:27
7
How can organizations prevent sabotage and manipulation in internal prediction markets?
36:27–43:45
8
What real‑world examples show prediction markets in action and their outcomes?
43:45–50:01
Speakers
1 identifiedMore from Elucidations
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