For partnerships to succeed, both buyer and supplier must see significant value in the relationship. High spend indicates strategic importance, ensuring mutual commitment. If the buyer is a core customer for the supplier, and has a high spend, partnership sourcing is mutually beneficial.

in tiered supply chains, a closer-tactical relationship could be used between a buyer and a supplier who will be responsible for co-ordinating the activities of other suppliers (p.8 of the textbook).

Comprehensive and Detailed Explanation:
Collaborative partnering relationships are characterized by high levels of trust, mutual objectives, shared information, and long-term commitment. Among the options provided:
* Co-destiny: This represents the highest level of collaboration, where both parties' futures are closely linked, and decisions are made jointly for mutual benefit.
* Strategic alliance: This involves a formal agreement between organizations to pursue shared objectives while remaining independent entities.
These relationship types are positioned on the collaborative end of the relationship spectrum, emphasizing joint efforts and shared success.
Reference:
CIPS L4M6 Study Guide

Adversarial and Arm's Length relationships have low levels of trust. Single Source, Partnership and Outsourcing require high level of trust. See p.5 for the Supplier Relationship Spectrum

Two invalid reasons are; one late delivery and a change in senior management. Valid reasons to terminate a relationship are listed on p.107 and include the three listed here, as well as a material breach, damage to reputation and the supplier merges or is acquired by another company.