# Why do I receive multiple updates to markets with the same id in the odds\_change message?

A market is uniquely defined by its *id* AND *specifiers*. Many markets have multiple lines, and the Betradar system provides odds updates for multiple lines in the same odds-update (e.g. the totals markets). More details on markets and specifiers may be found in the [concept](/uof/introduction/key-concepts.md) section.

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