Comprehensive and Detailed Explanation:

Therelationship spectrumin procurement outlines the range of relationships between buyers and suppliers, from transactional to strategic partnerships. Key types include:

Transactional:Short-term, price-focused relationships with minimal collaboration.

Partnership:Long-term, collaborative relationships with shared goals and mutual benefits.

While "contractual" refers to the legal agreement aspect of relationships, it is not a specific type on the relationship spectrum. "Conspiratorial" is not a recognized relationship type in procurement contexts.