We've had Multiple Choice and Free Response markets for a long time, but our top creators often avoid using these because they market mechanism they use is Dynamic Parimutuel, meaning:

• The payouts aren't fixed

• You can't short (bet NO) on a specific option

• There's no limit orders

James has a proposal to change this, by using one Constant Product Market Maker (the system we use for Binary aka Yes/No markets today) for each of the options in a multiple choice markets.

After some research, I think something like 70-90% of markets today should actually be a Multi Binary market; e.g.

• [Single event] Which team will win the NBA Finals 2023?

  • Nuggets?
    Heat?

• [Multiple events] Who will endorse Trump?

  • Mike Pence?

  • ...

• [Grouping related] At the end of 2023, will Twitter...

  • Be profitable?

  • Increase DAU?

• [Uncertain Date] Will the US Debt Ceiling be raised by...

  • June 2023?

  • July 2023?

See our thoughts on Notion:

• https://manifoldmarkets.notion.site/MultiBinary-Product-Spec-fe7b741b84e049099d44cb826ae5f271

• https://manifoldmarkets.notion.site/Multi-set-of-binary-markets-8bd7ad1fde074e67b75bc1dd65f9a59a

EDIT: Market resolves according to the criteria outlined for the other "most impactful 2023" markets; likely some kind of decision process (vote, poll, quadratic funding) that we agree on among Manifold core team members. We should only pick 1 "most impactful feature".