Every company in this business is organized differently. Some have inside and outside sales teams, some run more like a call center, some have independent reps who should only ever see their own accounts and owners who need to see everything. Permissions run at page and action level first, then down to the row and the field, so weight, revenue and profit are separate grants.
If you are setting up a user administrator who manages other users without holding full administrator rights, read Delegating user management of non-sensitive user roles alongside this.