Knowledge graphs can be a powerful tool for transforming invoice data and lowering costs in business operations. They organize information in a web of relationships between entities, allowing for the visualization and analysis of how they interact. By applying knowledge graphs to invoice data, companies can spot trends, detect anomalies, and understand patterns in their procurement and supply chain. This enables them to negotiate better prices with suppliers, lower supply-chain risks, and identify high-centrality suppliers. For example, a company found that purchasing 33,000 mayonnaise containers from a single supplier resulted in savings of around $410,000 if purchased at the lowest price. By leveraging knowledge graphs, businesses can make data-driven decisions to optimize their relationships with suppliers and reduce costs.