DBMS_RESOURCE_MANGER and affect on users not in any of the resource consumer groups

 A database I started working on has had resource manager implemented a couple of years before.  Unfortunately new users created since then have not been added to any of the original resource consumer groups.  My question is
are the resources used by users not represented by any of the consumers affected at all by the resource manager.  This is a production
system and before we make any adjustments I wanted to verify how the configuration is currently working with 'orphaned'
users.

Thanks