Market
A market groups the that compete in one space inside a . Every workspace has at least one - created with the workspace and named for what you compete in - and every topic belongs to exactly one. Brand topics sit outside markets, because a brand is not a competitive space.
Most workspaces only ever have their original market, and the product stays flat: markets only appear once a second one exists. Add one when a workspace spans several distinct competitive spaces, such as Office and Xbox.
Filing a topic in a market does not change measurement, rank, or what you pay for. Deleting a market moves its topics to your original market and leaves them measuring exactly as before; the last market cannot be deleted.
A market is not the workspace itself. The workspace is the boundary for permissions, billing, and reporting.