Supply chains are naturally risky. Their flow of materials through different organisations, each run differently on operations, objectives, cultures and structure, distributed around the globe, and widely working in different conditions. Furthermore, they move through war zones, instability among different regions, government changing policies, new trade agreements and every other problem that you can think of. For example, in 2004 Tsunami in the Indian ocean, or hurricane Katrina in New Orleans in 2005. Both are perfect examples of once off incidents but show that they are in the background relating to external risks.
