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  • regis hattori thinks this is interesting:

There is a practical way to support eventual consistency in a DDD model. An Aggregate command method publishes a Domain Event that is in time delivered to one or more asynchronous subscribers:

From

Cover of Implementing Domain-Driven Design

Note

I thought that this type of technique (using reference by id and eventual consistency) was used only when considering different bounded context and not in different aggregates.