A further example for horizontally integrated planning is Bhattacharjee and Ramesh (2000). They examine a multi-period retailing problem for a monopolistic retailer dealing with a product with limited product life cycle. A model is presented that optimizes dynamic pricing and ordering policies jointly. Tell is and Zufryden (1995),as well, provide a model,which integrates dynamic pricing and ordering by determining the optimal timing and depth of retail discounts. These examples show the need for communication flows and alignment between individual planning modules. The communication flows in form of instructions, anticipations and feedback loops will be part of the further analyses in this work.