A prediction contest will determine whether the S&P 500 index reaches a new all-time high in 2023. The outcome is set by Scott Alexander's judgment, as outlined in his future posts on the Astral Codex Ten platform. On Metaculus, participants can submit their predictions but note that only those tracked within their individual tracks will be considered, with Alexander's authority being separate from evaluation purposes. Resolution for all contests is contingent upon Alexander's statement on the topic by a specific deadline in 2023. The outcome is a binary assessment of yes or no.