Black holes have an extremely powerful gravitational force. Virtually nothing can escape from them.
Within a complex supply chain a "black hole" can be a massive (unknown) risk for your entire business.
Are you able to detect black holes in your supply chain?
Here is a surevey to test your knowledge of your supply chains.
https://app.lamapoll.de/SupplyChainMapping/en/
Compare your results with the ones from other participants.