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As in other Inkling markets, participants in this market invest virtual money - no real cash here - based on their predictions of who will win the primary. The stock price for a given candidate at a given moment is the market's consensus of the likelihood that that candidate will win. That price moves like a real stock price - up when participants buy more shares and down when they sell. When the primary is over, participants will receive 100 inkling dollars per share of the winning stock owned.
As the administrator of the Massachusetts Fifth market, I cannot participate, but I can report that even before I was able to report on the market, an Inkling "investor" had already bought stock in Rep. Barry Finegold (D - Andover), putting him into an early lead at $28.35 per share, which translates into a market consensus of a 28.35 percent chance of victory. This will change as more investors enter the market.
The market will end at noon EDT on September 4. As soon as a clear winner is established, investors in the winning stock will be awarded their winnings.