Comment by dash2
1 day ago
An argument not mentioned here and which I didn’t appreciate until I actually took part in these markets myself, is that you need a supply of stupid/uninformed people to take the other side of the informed people’s bets.(In economic terms, no-trade theorems apply.) That suggests to me that the dream of perfect information revelation isn’t going to come true. Instead, the liquid markets will be those with a large supply of marks, who bet for identity reasons or who are simply ignorant and naive. (Currently polymarket gives a 16% ish probability that Trump will lose office this year. Sounds like wishful thinking to me?)
Polymarket "odds" I think are just the price of the contract * 100 right?
That's not actually the predicted odds by the market because every single bet is also a bet on interest rates.
A contract that literally 100% always would resolve to "true" in 1 year would have a non-zero price for the "false" side because selling that option (and thus taking the "false" side means you get ~$97 today and then pay $100 in a year.
Polymarket's 4% chance of jesus returning by 2026 actually represents a market consensus of basically a 0% chance.
For trump losing office there might be some bets predicated on his losing office being correlated to a higher interest rate outcome, too.
If the odds are set correctly, you should have the same EV on either side of a bet.
That's why it's hard to beat Vegas at sports betting--they set the correct odds way too often.
When regular folks make up their own odds, they're not very good at it, but in theory the market just buys up any +EV position, even if it's a longshot.
I agree with you overall but I'm not sure the Trump bet is the best example.
He certainly isn't going to be thrown out of office (unfortunately) but those 16% of bettors also win if he dies this year, and he's 80, fat, still gobbling burgers and shows signs of someone that has had at least one stroke so far.
On the other hand he has access to the best medical care, but even still a 16% chance he drops dead before the end of the year isn't that outrageous.
So for example "shows signs of someone that has had at least one stroke so far" sounds like the kind of "information" that has not yet made it into a mainstream news outlet, probably for good reason. And indeed when I searched, I found it on The Daily Beast, whose reliability I doubt.
But maybe I'm wrong. If so, you could always take the opposite side of the bet. For sure, the correct probability is not zero!
Checks annuity tables for an 80 year old making it to 81...you giving 1:6 odds? Sure I will take that bet because the actual odds are only a small fraction. If I spread out the risk on multiple positions, I can make a very good return taking those types of bets.
People that place bets on the political outcomes on PolyMarket are from one of three groups: 1) Insiders who think they have an edge (but probably don't), 2) fools that believe what their media of choice tells them and 3) People who make money on the first 2 groups.
We both know that that the Trump market and people who believe everything they see on MSNBC (or whatever it is called now) have a big overlap. Its basically a way to print money because there are always people who are out of touch enough to believe their side is right 100% of the time and a <insert color here> wave is coming in the next election. Is this taking advantage of them? Maybe, but they are a walking negative externality in every other way in life so why not. Consider it a tax on political extremism and partisanship which I think it a good thing. Prove me wrong...