This market focuses on the eradication of polio, defined as the permanent global cessation of circulation of the poliovirus and the elimination of poliomyelitis (polio). The resolution date will shift based on market odds: it will move closer as the odds increase, and further away as the odds decrease. Initially, with 50% odds, the resolution date is set 50 years in the future. If the odds rise to 60%, the resolution date changes to 40 years in the future. Conversely, if the odds drop to 40%, the resolution date moves to 60 years in the future. Each change of 1% in odds adjusts the resolution date accordingly by one year. The market will resolve to YES when it trades at 99% and the resolution date one year ahead is reached. It will resolve to NO when it trades at 1% and the resolution date 98 years ahead is reached.