摘要：The most popular inventory model to determine production lot size is Economic Production Quantity (EPQ). It shows enterprise how to minimize total production cost by reducing inventory cost. But, three main parameters in EPQ which are demand, machine set up cost, and holding cost, are not suitable to solve issues nowadays. When enterprise has two types of demand, continue and discrete demand, the basic EPQ would be no longer useful. Demand continue comes from customer who wants their needs to be fullfilled everytime per unit time, while fullfillment of demand descrete is at a fixed interval of time. Literature review is done by writers to observe other formulation of EPQ model. As there is no other research can be found which adopt this topic, this study try to develop EPQ model considering two types of demand simoultaneously.
关键词：Economic Production Quantity; demand kontinue; demand discrete
