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Popular Science Predictions Exchange
Popular Science Predictions Exchange (PPX) was an online virtual prediction market run as part of the ''Popular Science'' website. The application was designed by the same group behind the Hollywood Stock Exchange using their virtual specialist application. Users traded virtual currency, known as POP$, based on the likelihood of a certain event being realized by a given date. Stock prices would range between POP$0 and POP$100 and were intended to reflect the general confidence of the users about that event. A stock at price POP$95 would mean roughly that users believed there to be a 95% chance of the event happening. If an event was realized by the given date, the stock will pay out POP$100 per share. A stock that did not occur by the closing date was worth POP$0 per share.
On May 8, 2009, PopSci announced that the PPX exchange would close on May 31, 2009, almost two years after it first opened. At the time of the announcement, there were 33,339 registered users. The top 100 traders at the time of closing were listed in a hall of fame.〔(【引用サイトリンク】title= PPX: The Final Countdown )〕 Another news post on the site suggests that the site was planned to only have a two-year run.〔(【引用サイトリンク】title=PPX is Closing, but Its Not Over Yet )〕
==General==
Each user begun with POP$250000 which could have been invested in any of the available stocks. By taking a short survey, users were awarded an additional POP$10000. Each Monday, Wednesday and Friday a new IPO was introduced to the market. Following an IPO, users could buy or short shares of the stock based on their feelings of its practicality. To maintain fairness to new users, no user could own more than 1,000 shares of a particular stock at one time and no one could buy a particular stock for several hours after a new stock is introduced to give everyone a fair chance of purchasing it at its introductory POP$50 a share. The price of the stock was then used as an indicator of user confidence in that event and also as a way to increase one's net worth. As new information became available to the public, stocks prices were further refined as users moved to better their position on that stock.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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