Thinking about the German election outcome, it struck me that this would be an ideal test for betting markets. I’ve always thought that, if there’s a bias in such markets it would be towards the right, so the toughest test for them would be predicting a left-wing upset win like this one (I’m calling a win on the basis that left parties got a majority of the vote, not making a prediction about what goverment might emerge). A quick Google reveals that there is such a market, called Wahlstreet but my German isn’t good enough to deal with their site, which has lots of graphs bouncing around without an obvious control. Hopefully someone will be able to help me.
Anyway, if there’s a contract allowing a bet on the share of votes for the three left parties (SPD, Greens, Left party) and if, two weeks in advance, that market was predicting a vote share of more than 50 per cent (as actually happened), I’ll concede that the case for the superiority of betting markets over polls has been established, at least as a reasonable presumption. [I didn’t follow the polls closely but I had the impression that most of them were predicting a CDU/CSU win until the last days of the campaign].
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