Comprehensive and Detailed Explanation From Exact Extract of Documents:

The correct answer is that labour standards vary from country to country. According to the L5M5 study guide (p.85), while international conventions exist (e.g., ILO conventions), there is no single binding international law regulating labour standards across all nations. Instead, each country enforces its own rules regarding wages, hours, and working conditions. Some countries have strict protections, while others may have weak or poorly enforced standards. Therefore, procurement professionals must apply due diligence and supplier audits when sourcing internationally, as ethical risks arise in jurisdictions with lower labour protections.

Reference: Managing Ethical Procurement and Supply (L5M5) Study Guide, p.85