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between individuals (i.e. gambling, but without a bookmaker). Propositions are put up on the web site, such as Bush will win in Nov. or the Lakers will win a certain game. Then people can propose a price for a contract that expires when Bush or the Lakers win or lose the election/game in question. If you bought a contract and the proposition is true, you win. If you sold a contract and the proposition is false, you win. There is no bookmaker because each contract is traded between two individuals.
The contracts are worth $10, but are valued on a scale of 0 to 100. If you buy a Bush wins in Nov. for 50, it costs you $5. That $5 goes to the person who sold you the contract. If Bush wins, you get $10 from the person who sold you the contract, if Bush loses, the person who sold you the contract gets to keep the $5. But the price of the contract is determined by what people are willing to pay, so it fluctuates. If an event is seen as likely, the price moves closer to 100, if it is unlikely, the price moves closer to zero. Notice that there is no 'Kerry wins' proposition, if you think Bush will win, you buy contracts, if you think Kerry will win, you sell contracts.
This is exactly how the NASDAQ operates. So, the people on the site tend to involved in financial services (because it's a little hard to understand at first). They also tend to be conservative. If the Bush wins goes below 50, that means that there are enough people who really believe he is going to lose that they risk losing more money than they stand to gain.
It's better than an opinion poll, because people put up real money. Also, insider trading is not illegal. If you know something secret, you can make a lot of money.
Also note that even though it doesn't settle up until Nov., imagine if you sell Bush at 50, he drops to 25, so then you buy at 25, you have locked in a profit of $2.50 per contract minus commisions.
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