Final answer:
The supplemental agreements must be ratified before the National Master Agreement of the teamsters can be fully ratified. These address specific regional or industry concerns and require approval from the affected union members.
Step-by-step explanation:
The part of the teamsters agreement that must be ratified before the National Master Agreement is fully ratified is the supplemental agreements. These are separate agreements that apply to various regions, industries, or locals and address specific concerns relevant to the members in these areas. Each supplemental agreement needs to be approved by a majority vote of the union members it affects. Until all supplemental agreements are ratified, the National Master Agreement cannot go into effect, even if it has been approved by the overall membership.
Ratification of these supplemental agreements is a crucial step in the process, as they often contain provisions regarding wages, working conditions, and other work-related issues that are vital to the members represented by the particular supplements. It's important to note that these agreements are negotiated to be in alignment with the terms of the National Master Agreement, but they cater to the unique needs of different member groups.