Traditional import-export statistics record only the last exporting country of a shipment, but modern supply chains involve multiple layers of transshipment: a chip may be manufactured in Taiwan, sent to Vietnam for testing, then exported to the U.S. from Vietnam, with customs only seeing Vietnam as the source. Supply chain tracking technology attempts to reconstruct the true origin of each manufacturing stage, calculating a buyer's "true exposure" to specific countries or regions. For trade professionals, this concept is highly practical: when customers or compliance departments ask "how much of your product originates from a particular country," answering based solely on direct sourcing may underestimate actual geopolitical risks. Understanding the multi-layered structure of your own supply chain helps you prepare accurate traceability data in advance in an environment where customer due diligence and regulatory compliance requirements are becoming increasingly stringent.