Given they now need to pay a fee to DZConneX, how do we know suppliers won't simply turn around and increase their prices to Harvard?

There are three factors that will reduce this tendency. Suppliers enrolled in the program have agreed to standardized mark-ups, which are enforced in Fieldglass. Most requisitions will be competitively-sourced, with multiple suppliers competing for Harvard's business. Third, hiring managers make the final decision on which candidates and rates to accept.