Due to the parimutuel structure used in Manifold's open response markets, this market should close before the announcement of TIME's 2023 Person of the Year. Otherwise, there is very little reason to bet on earlier years. If for instance TIME names an AI Person of the Year 2023 while the market is still open, traders can sell off other options and buy up as many 2023 shares as they want, devaluing early betters' shares.

From Manifold's FAQ:
Closing date for Free Response Markets

• Free response markets use a different system, therefore it is important that the market is set to close before a clear resolution is known. Otherwise, users who bet early could be disadvantaged compared to the more informed bettors."