Prediction markets/betting markets like Intrade or Betfair pretty universally set time limits on their bets. (Browse through Intrade sometime.) This does sometimes require changing the bet/prediction though—from ‘the Higgs boson will be found’ to ‘the Higgs boson will be found by 2020’. Not that this is a bad thing, mind you.
Prediction markets/betting markets like Intrade or Betfair pretty universally set time limits on their bets. (Browse through Intrade sometime.) This does sometimes require changing the bet/prediction though—from ‘the Higgs boson will be found’ to ‘the Higgs boson will be found by 2020’. Not that this is a bad thing, mind you.