alt Hacker NewsAn 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?)
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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.
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.