The temporal distribution of refund requests for a promotional offer is represented by a lifecycle curve. Typically, the majority of requests occur at the beginning of the campaign, with a peak at the end of the offer’s validity period. However, the shape of the curve depends on the offer’s terms and conditions. If the terms and conditions impose a deadline for sending the request after purchase, the dates of requests are closely linked to product availability on store shelves. “Standard” lifecycle curves for refund offers can be useful for organizing the workload within the company. For example, an illustration of a response/request curve for a refund offer is available in the “Refund Offer Memo” document.