The bank example is useful, because it tends to elicit the right thinking for people, but banking has a long history of eventual consistency. For the vast majo

The bank example is useful, because it tends to elicit the right thinking for people, but banking has a long history of eventual consistency. For the vast majority of the history of banking, local branches (which is a very loose term here, e.g. a family member of the guy you know in your hometown, rather than an actual physical establishment) would operate on local knowledge only. Consistency is achieved only through a regular reconciliation process. Even in more modern, digital times, banks depend on large batch processes and reconciliation processes.