Different tiers of users

Summary of Roles
Administrator – Somebody who has access to all the administration features
Editor – Somebody who can publish posts, manage posts as well as manage other people’s posts, etc.
Author – Somebody who can publish and manage their own posts
Contributor – Somebody who can write and manage their posts but not publish posts
Subscriber – Somebody who can read comments/comment/receive news letters, etc.

Thanks so much! So if I want everyone to be able to write and post and nothing else, I’d make them Authors, not editors, right? That way their posts will go up on the site so they can respond to each other?