Prediction Markets + Market Predictions = Collective Forecasting That Pays Off

Tag Archives: Market Liquidity

BRITISH CRETINERY: The Financial Times features the InTrade probabilities —not the BetFair ones.

This is really stupid. The decerebrated journalos at the FT chose to feature the illiquid, Ireland-based, un-regulated InTrade prediction markets instead of the very liquid, UK-based, regulated BetFair prediction markets on the next British congress.
Makes no sense at all.
The BetFair PR boys have an omelet on their face. They should work harder.
DISAMBIGUATION: The “illiquid” adjective [...]

What is the liquidity on InTrade’s financial prediction markets?

My dear honorable Carlos Graterol,
I acknowledge you are a little InTrade fanboy, and that flies OK in my book. You say there are 3,000 daily transactions on the daily DJIA prediction markets. (It was much higher than that before the CFTC fined InTrade.) While I reckon that this liquidity is enough to generate trustworthy predictions, [...]

InTrade is exaggerating the usefulness of collective forecasting via prediction markets.

Look at the market liquidity —too insignificant to say anything:

InTrade (like many other industry players and scholars) are exaggerating the usefulness of the prediction markets. When there is no liquidity, just keep your mouth shut. Wait until the market liquidity becomes more serious.

BetFair traders are getting ready for the BOOM.

BetFair:
[...] we’ll be enabling the new matching process on soccer match odds markets, tennis match odds markets and greyhound win markets taking place on the UK exchange shortly.
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Previously: BetFair’s new bet-matching logic…. (endorsed by Giberson International Incorporated).
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How BetFair stole Bastille Day from the French —and how Ed Murray became BetFair’s best friend (NOT A HOAX).

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Michael Giberson (professor of economics and chairman of our scientific advisory board):
Actually, I would expect the change to improve liquidity, but the real surprise for Ed Murray is that other than his liquidity argument, I pretty much agree with him this time.
It is a better scheme than before, as the exchange will match traders’ bets [...]

In a blow to the French, BetFair choose Bastille Day to premiere the revised version of the bet-matching logic of their prediction markets. — IMPROVEMENT MEANS BETTER LIQUIDITY FOR THEIR EVENT DERIVATIVE TRADERS.

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BetFair:
Improvements to Betfair’s bet matching logic today, Monday 14th July:
What’s changing?
We’ve improved the code that matches bets. As well as matching backs against lays as we’ve always done, we’ll also try to match your bet against bets on other selections in the market. We‘ll give you an improvement over the price you‘ve requested where possible, [...]

Robin Hanson’s purity test is based on an absurd principle.

It’s not the motivation that is important to assess —it’s the liquidity that counts. The more trades, the better. Liquidity leads to statistically accurate probabilities predictions. Liquidity, liquidity, liquidity, doc.
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Robin Hanson:
One proposed distinguishing criteria includes the size of an individual trader’s stake, and the number of traders. The Iowa Electronic Markets are limited on both [...]

Ubber finance blogger Barry Ritholtz believes in magic. He believes that, with more volumes on the event derivative markets, comes the Omniscience —capital “O”.

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Our good friend Barry Ritholtz.has persuaded himself that our real-money prediction markets suffer from an irremediable and fatal problem: liquidity on political event derivative markets is too thin for smart Wall Street people like him to take their market-generated probabilities seriously. Barry Ritholtz is keen to tout oranges–apples comparisons: the NYSE volume versus the Obama–Clinton [...]

Harvard fella says prediction markets are doomed.

He bases his brilliant reasoning on “rumors” and total ignorance of the participation inequality law.
Another academic fella who would be better off researching his topic before blogging on something he does not master.
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Prediction markets tend to be so illiquid, though, that mere activity looks like volatility.

Excellent comment from our national Jason Ruspini.
[Conversation started off at Felix Salmon's.]
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