MIN goes over all the values you provide. The values can be provided directly between the brackets, separated by commas or can come from a single list.
This expression will always return the value that is lower, whether that is the actual or the expected amount of assets under management for the entity.
This expression works in a couple of steps to bring you the result:
MIN(...) is the overarching function, of which you want the result. In between its brackets sits another function.
get_properties_from_instances(...) is the function inside the
MIN brackets, which goes and fetches the property of the instances you specify.
instances(AccountHolder, personal_income) returns the personal income of all the accountholders.
Since there could be no account holders, we add 0 as a default value to return.
These four combined, give you the single lowest value out of the personal incomes for all the accountholders in the case.