Arkestro projects savings using many contextual views of your purchasing patterns. The views can be summarized in three categories:

Price Variance Savings - the sum of differences in prices paid from transaction to transaction. These differences could be within the same supplier or across suppliers.
Strategic Sourcing Savings - The amount of total annual spend that can be saved by leveraging multiple suppliers, consolidating quantities for discounting, and using other competitive techniques like those present in Arkestro sourcing events.
Trend Savings - The amount of savings that can be achieved by preventing consistently rising prices. A rising price trend may be attributable to the increasing cost of inputs for an item. Contracting and indexing prices are the primary tools to achieve price trend savings.