What is a network externality?

No GravatarKeyword Of The Day: NETWORK EXTERNALITIES

Network externality has been defined as a change in the benefit, or surplus, that an agent derives from a good when the number of other agents consuming the same kind of good changes.

Previous blog posts by Chris F. Masse:

  • Collective Error = Average Individual Error – Prediction Diversity
  • When gambling meets Wall Street — Proposal for a brand-new kind of finance-based lottery
  • The definitive proof that it’s presently impossible to practice prediction market journalism with BetFair.
  • The Absence of Teams In Production of Blog Journalism
  • Publish a comment on the BetFair forum, get arrested.
  • If I had to guess, I would say about 50 percent of the “name pros” you see on television on a regular basis have a negative net worth. Frightening, I know.
  • You can’t measure the usefulness of a system by how many resources it consumes.

CORRUPTION IN TENNIS: the Nikolay Davydenko vs. Vassallo Arguello prediction markets at BetFair

No GravatarAs Midas Oracle has reported, BetFair decided to void all bets because its 40-person anti-corruption team detected foul speculation:

  • The volume was ten times higher than the normal-
  • The clear favorite (Nikolay Davydenko) was short-sold en masse one hour before the start of the tennis match-
  • Nikolay Davydenko (who won the first set, but lost the second set) declared an injury in the third set and resigned from the game.

Nikolay Davydenko

Czarek Sokolowski / AP

&#8212-

The Numbers Guy (who blogs for the Wall Street Journal) has interviewed the BetFair manager responsible of the anti-corruption team at BetFair, and tries hard to come up with explanations for the foul betting. He can&#8217-t.

[&#8230-] To verify, tape of the match would have to be reviewed to see if Mr. Davydenko’s injury was apparent. Mr. Marks told me that a Betfair employee watching the match saw no evidence of injury until a trainer visited Mr. Davydenko in the second round. [&#8230-]

It looks like Nikolay Davydenko, before the match, had alerted some accomplices that he would resign in the third set. Those accomplices would have short-sold him at BetFair. But it&#8217-s of course impossible to accuse a professional tennis athlete of foul play without strong evidence.

&#8212-

UPDATE

Did we suspect an innocent??

Bet scandal worries Davydenko

RUSSIAN Nikolay Davydenko is worried his reputation will suffer after becoming embroiled in a betting controversy. Davydenko retired with a foot injury in the third set of his match with Argentine Martin Vasallo Arguello at the ATP event in Sopot, Poland, last week, only to find the match was at the centre of a betting scandal. &#8220-It&#8217-s so surprising,&#8221- Davydenko said in Montreal, where he is competing in the Masters Series tournament. &#8220-Like, who can know that I can be injured and (would) retire in my match? &#8220-I am disappointed, because I&#8217-m a top player and people are talking (about it) not only in Russia, in my country, (but) also talking everywhere in the world. &#8220-It is pretty tough for me, I get more pressure now. Mentally, it&#8217-s pretty tough.&#8221- British betting exchange Betfair voided all bets on the match, saying $8.55 million had been placed on it, more than twice the usual amount. Though world No. 5 Davydenko won the first set, Vasallo Arguello &#8212- ranked about 80 places lower &#8212- became the favourite, the opposite of normal practice in such a situation. Betfair voided all bets and notified the governing body of men&#8217-s tennis, the ATP. Davydenko said he was not in contact with anyone regarding the throwing of a match. &#8220-I play 30 tournaments in a year,&#8221- he said. &#8220-Last year I lost 10 tournaments in the first round and also sometimes I&#8217-m injured and I retire from a match.&#8221-
– Reuters

NEXT: BetFair has an anti-fraud team whereas InTrade-TradeSports has none.

Read the previous blog posts by Chris F. Masse:

  • A climate scientist takes a close look at InTrade’s global warming prediction markets…
  • Terrorism Futures
  • The secrecy-seeking Mark Davies is solely to blame for all this mess… but this vibrating BetFair spin doctor has managed to repair the PR damages quite brillantly, it shall be said.
  • A Betting Exchange = A Bookmaker —> !??
  • BetFair’s new bet matching logic + BetFair Malta’s trading on the multiples
  • Dick Cheney, the new Churchill?
  • BetFair Malta’s combo market maker (trading algorithm + human market makers) operating on the multiples

Is your firm among the early adopters of internal prediction markets used as forecasting tool?

No GravatarIs your boss a visionary? Or is he/she among the laggards?

Technology Adoption Life Cycle

Previous blog posts by Chris F. Masse:

  • If Midas Oracle were to meet, would we use Huddle, and why?
  • WORLD’S SUCH A SMALL PLACE: Smarkets meet HubDub.
  • 50% of our prediction market luminaries have a MacBook.
  • STRAIGHT FROM OUR TRUISM DEPARTMENT: Money buys happiness.
  • Ron Paul (R) and Barney Frank (D) ally together to attack “the practical hurdles of the federal law, known as the Unlawful Internet Gambling Enforcement Act, rather than its legitimacy”.
  • Clicking on the “SPHERE: RELATED CONTENT” button, at the bottom of each Midas Oracle post, will bring you a list of external webspots.
  • FRIGHTENING: Jed Christiansen’s prediction market blog was briefly overtaken by web spammers, who inserted invisible links to their commercial sites so as to game the Google PageRank system.

SPORTS CORRUPTION: The dark side of the prediction markets

No GravatarBetFair:

Market Suspended – Martin Arguello v Nikolay Davydenko

Betfair Customer Services 02 Aug 18:45
Betfair has suspended settlement of the betting markets on this afternoon’s second round match of the ATP Orange Prokom Open in Poland between Martin Arguello and Nikolay Davydenko, pending investigation and consultation with relevant regulatory authorities. Betfair has had a Memorandum of Understanding with the ATP since 2003, and will use it to exchange information should it become necessary.

&#8212-

All bets are void in Davydenko v Arguello match

Betfair Customer Services 03 Aug 11:46
Following consultation with the men’s professional tennis tour, the ATP, Betfair has decided to void all bets [*] placed on Thursday’s 2nd round match between Nikolay Davydenko and Martin Vassallo Arguello at the Orange Prokom Open. Betfair suspended settlement of bets at the conclusion of the match yesterday because of concerns over irregular betting patterns. The company has taken this action in the interests of maintaining integrity and fairness in all our markets.

[*] First time in the history of BetFair.

Times – Telegraph

&#8212-

BetFair (which is a regulated betting exchange) has signed agreements with over 25 sports bodies and has an internal team looking for foul betting. TradeSports-InTrade (which is an unregulated betting exchange) has none. Thus, it is quite possible that some sports prediction markets at TradeSports are rigged. You will notice that nobody in America asks this tough question. (All US-based prediction market conferences being sponsored by InTrade-TradeSports, and all the US-based researchers being depend on InTrade-TradeSports data, no wonder.)

Midas Oracle and CFM are the only publications that tell you the whole truth about the prediction markets:

  • the good side,
  • and the dark side.

&#8212-

ADDENDUM: The BetFair people do not send anonymous insults sent from fake e-mail accounts. They are professional and ethical people.

&#8212-

Previous: BETFAIR DOES FIGHT VIGOROUSLY ANY ATTEMPTS AT MONEY LAUDERING. + BetFair on Responsible Gambling

NEXT: BetFair has an anti-fraud team whereas InTrade-TradeSports has none.

Read the previous blog posts by Chris F. Masse:

  • Terrorism Futures
  • InTrade-TradeSports and BetFair-TradeFair should take a close look at Cantor Fitzgerald’s strategy to gain a share of the $100 billion U.S. gambling industry.
  • The secrecy-seeking Mark Davies is solely to blame for all this mess… but this vibrating BetFair spin doctor has managed to repair the PR damages quite brillantly, it shall be said.
  • A Betting Exchange = A Bookmaker —> !??
  • BetFair’s new bet matching logic + BetFair Malta’s trading on the multiples
  • Dick Cheney, the new Churchill?
  • BetFair Malta’s combo market maker (trading algorithm + human market makers) operating on the multiples

Get your prediction market fix from Midas Oracle -daily.

No GravatarBee

by aussiegall

Previous blog posts by Chris F. Masse:

  • 50% of our prediction market luminaries have a MacBook.
  • STRAIGHT FROM OUR TRUISM DEPARTMENT: Money buys happiness.
  • Ron Paul (R) and Barney Frank (D) ally together to attack “the practical hurdles of the federal law, known as the Unlawful Internet Gambling Enforcement Act, rather than its legitimacy”.
  • Clicking on the “SPHERE: RELATED CONTENT” button, at the bottom of each Midas Oracle post, will bring you a list of external webspots.
  • FRIGHTENING: Jed Christiansen’s prediction market blog was briefly overtaken by web spammers, who inserted invisible links to their commercial sites so as to game the Google PageRank system.
  • InTrade ditch market-leader Bloomberg for low-cost, second-tier data provider eSignal.
  • Drawing a parallel between our reluctance to seek advice and the experts’ reluctance to take the market-generated probabilistic predictions in an un-discriminating, un-critical fashion

Show Your Support – Buy shares of James Miceli for Congress at InklingMarkets.com

No GravatarJames R Miceli for Congress

&#8212-

Justin Wolfers and Eric Zitzewitz were asking, &#8220-How to attract uninformed traders?&#8221-. (PDF file) Well, here&#8217-s one answer. Make suckers believe that Inkling Markets is like a voting system, where the more supporters show up for a political candidate, the more likely it will be that their candidate will get the nomination/election. (See Mike Giberson&#8217-s excellent blog post, yesterday, for more info.)

REALITY CHECK: The &#8220-votes&#8221- sent to Inkling Markets by the uninformed traders will be overturned over time as the active and informed traders (the &#8220-market makers&#8221-) go trading on this particular prediction market.

&#8212-

Previous blog posts by Chris F. Masse:

  • “Is Clinton’s Pennsylvania Lead Really 20 Points?”
  • The Most Surprising Piece Of News I’ve Heard Today
  • My first prediction market plugin for WordPress
  • Self-Serving Prediction Market Of The Day — Unlawful Internet Gambling Enforcement Act of 2006
  • Prediction markets tend to be so illiquid, though, that mere activity looks like volatility.

Interpreting fed funds futures

No Gravatar

Despite what you may have read elsewhere, the probability of a fed funds rate cut has increased significantly over the last few weeks.

Felix Salmon and Barry Ritholtz seemed to find more merit in this analysis from WSJ Real Time Economics than I did.

Since the stock market began to sink a week ago, the federal funds rate for next January, as implied by futures markets, has plummeted to 5% from 5.2%. As a result, the implied odds of a quarter-point rate cut from the current 5.25% are said to have risen from 20% to 100%.

Well, nobody in their right mind would ever describe the odds as 100%, but let us not get diverted.

Lou Crandall, chief economist at Wrightson Associates, says while such action is commonly attributed to increased expectations of a Federal Reserve rate cut, that would be a mistake. The real reason, he said, is that investors are fleeing risk and seeking safety in Treasury bonds and bills and other high-quality paper, sending their prices up and yields down. As a result, the entire yield curve has shifted down. To maintain parity with that lower yield curve, the implied federal funds rate also has to drop, he says.

Mr. Crandall says, &#8220-99% of the universe, including a lot of people in those trades, don&#8217-t do it because they think the Fed will ease but because that&#8217-s the way the yield curve is shaped.&#8221-

But wait a minute: isn&#8217-t that a violation of efficient markets? If fed funds futures were out of line with a realistic expectation of Fed action, couldn&#8217-t smart people take positions in the mispriced futures and make a bundle six months later when it turns out the Fed didn&#8217-t cut rates? And shouldn&#8217-t such arbitrage push expectations of the Fed and pricing of futures back into line?

No, says Mr. Crandall, for two reasons. First, the Fed has gotten more predictable but gives no guarantees on where rates will go, so there is no assured profit on such a trade (so it wouldn&#8217-t really be arbitrage). Second, &#8220-The amount of money backing people who have opinions about where the Fed will be in six or nine months is dwarfed by the amount of real money being invested in short-term credit markets.&#8221- Nervous investors are willing to accept a lower yield than what might ordinarily be justified based on the economics in exchange &#8220-for safety. Market participants know that perfectly well. That&#8217-s why it&#8217-s called a flight to quality.&#8221-

The first odd thing about this statement is that it seems to suggest that there are two competing theories of how fed funds contracts get priced. The first theory evidently claims that the contracts reflect investors&#8217- expectations of Fed actions, and a second, supposedly contradictory theory claims that the contracts just follow the Treasury yield curve, as if we have to choose whether the fed funds futures contracts are priced in a way that is consistent with expectations of what the Fed is going to do or if instead they are priced in a way that is consistent with the yield curve.

But of course the answer is that they are priced in a way that is consistent with both. These and every other financial market are responding to exactly the same news that we&#8217-ve been discussing here, and drawing the same conclusions as we have. The latest economic news points to a considerably higher likelihood of economic softness, a situation in which the Fed will want to lower the funds rate and short-term interest rates will come down. That scenario is priced in the fed funds futures, in the term structure of Treasuries, in the stock market, in foreign exchange, and what not. Here&#8217-s what&#8217-s been happening over the last few weeks to the price of the November fed funds futures contract, the simple-minded interpretation of which (and the one that I favor) is that the expected fed funds rate for November has now fallen to 5%.

nov_ff_aug_07.png

A second idea in the statement quoted above is the suggestion that one needs to add a significant risk premium to that fed funds futures calculation in order to arrive at the objective expectation of what the fed funds rate will be. It is true that risk premia play a role in the Treasury term structure, and fed funds futures should incorporate that same risk premia. A recent paper by Monika Piazzesi and Eric Swanson finds some indication that risk premia may play a role in longer-horizon fed funds contracts. But evidence for significant risk premia operating in very short-horizon fed funds contracts is much harder to find, as indeed theory predicts it would be. In recent years the Fed&#8217-s actions have become much easier to predict. As the accuracy of your forecast improves and the time horizon for your forecast gets smaller, the risk premium necessarily shrinks, and the risk premium on something you know with certainty has to be exactly zero. Perhaps Crandall is right that risk premia could be playing some role in the January fed funds futures contracts. But I find this story much less plausible for October or November contracts, and, as the figure demonstrates, movement in these was quite dramatic this week.

My guess is that we will indeed see a cut in the fed funds rate by the October 30/31 meeting, if not sooner.

The above article is cross-posted from Econbrowser.

The truth of the source code

No Gravatar

Call it Occam&#8217-s razor, minimization of information entropy, or just KISS principle. Call it &#8216-less is more&#8216-, usability or just common sense.

The question is, are the currently available prediction markets web services compliant with the era of attention economics? Are we able to attract a critical mass of users, thereby surpassing the tipping point needed to turn the mechanism of markets to a typical decision support and forecasting tool?

If a picture is worth a thousand words and assuming that a website&#8217-s source code is an unbiased descriptor of its complexity, I attempted to take a look at the homepages of some popular prediction markets web services, using this &#8216-websites as graphs&#8216- tool. In the results that follow, each cycle represents an html tag.

  • intrade

  • hsx

  • newsfutures

  • thewsx.com (by consensus point)

  • buzz game of yahoo, a source of inspiration to me

  • my beloved inkling markets

  • our approach at askmarkets.com (yet in alpha version)

P.S.: I didn&#8217-t include betfair because the graph occurred wasn&#8217-t descriptive of the true complexity of their homepage.

Cross-posted by gtziralis.com.

Thursday, February 22nd, 2007 – The day when Emile Servan-Schreiber was bull-shitting.

No Gravatar

Emile Servan-Schreiber&#8217-s blog post about the Dutch political elections and the NewsFutures prediction markets:

[…] At first glance, the quality of the market’s vote share predictions were somewhat disappointing compared to the three main polls […] However, the story changes dramatically if, instead of looking at the predictions just before the election, we consider the predictions several weeks earlier. Four to seven weeks before election day, the polls were much less reliable and the market clearly out-predicted them, individually and as a group. […]

This does not fly in my book. To be useful to us, the accuracy of the prediction should increase with time, not decrease.

UPDATE: Mike Giberson&#8230-

[…] Accuracy should improve in most cases as information improves, and generally we expect information about the near future to be better than information about the more distant future.

It is sort of fishy to, after the fact, go sorting back through the data to find “the” accurate prediction. Where is the theory? Better to take the missed predictions as real and try to understand them, rather than engage in after-the-fact data sifting to justify prior beliefs about the accuracy of PMs. […]

Should AEI-Brookings have allowed Midas Oracle to re-publish the text of the economists petition on prediction markets?

No Gravatar

New York Times:

Content Makers Are Accused of Exaggerating Copyright

An association of computer and communication companies, including Google, Microsoft and Yahoo, on Wednesday accused several professional sports leagues, book publishers and other media companies of misleading and threatening consumers with overstated copyright warnings. In a complaint to the Federal Trade Commission, the group, the Computer and Communications Industry Association, said that the National Football League, Major League Baseball, NBC and Universal Studios, DreamWorks, Harcourt and Penguin Group display copyright warnings that are a “systematic misrepresentation of consumers’ rights to use legally acquired content.” The complaint alleges that the warnings may intimidate consumers from making legal use of copyrighted material, like photocopying a page from a book to use in class. […]

At Midas Oracle, we never had any problem with copyright laws&#8230- except when it came to the economists&#8217- petition on prediction markets engineered by AEI-Brookings. We felt that it would have been better if the media and the bloggers were given permission to re-publish the text of the petition on its entirety &#8212-not just the abstract. We felt that it was a case where the goal of the authors was to maximize exposure of their ideas, not to maximize the power of the copyright rights holder.

Another reason to approve Steve Levitt and Koleman Strumpf for not signing the petition.

Previous: Economists’ Petition on Prediction Markets + Squawk on Prediction Markets – by Tom W. Bell + Bob Hahn turns the PETITION into a CONSENSUS. + Steve Levitt of Freakonomics: I WON’T SIGN YOUR PETITION, BOB. + Chris Masse’s comment on the Freakonomics’ blog post about the legality of US prediction markets + Safe Harbor Letter too Timid – by Chris Hibbert + The limitations of logic (and the need for passion) – by Caveat Bettor + Jason Ruspini on the Economists’ Petition