In this paper, the study, modelling and solution proposals of the famous Hockey Stick Syndrome (HSS) or End-of-the-Month Syndrome problem is presented. From this study it was possible to identify its causes and effects in a supply chain of massive consumption products in a continuous process. Equally, the impact was evaluated in the total cost function and solution strategies to the specific problem were established. The study is based on the use of an analytical model that reproduces the problem and the associate costs, then measures the effects and the magnitude of the solution. The solution aims to regularize the sale cycle flow. The results show a reduction of inventories, a better balance between the production and deliveries of products, as well as a larger efficiency in the use of the logistical resources. ----