Chapter $12-$ What are the primary reasons for holding inventories? $$ Please list and describe the four $(4)$ main costs associated with inventories. $$ Imagine that you are a manager at a supermarket, how could evaluate criticalness of an inventory shortage? As an inventory manage, what would you use$$the single$-$period model for? $$ Please share with us what do you know about the use of inventory management system at your workplace, or your voluntary place. $+++++++++++++++++++++++++++++$ Chapter $13$ As newly hired manager, you are asked to please list and explain the three $(3)$ main reasons why your company$/$firm should adopt ERP $($Enterprise Resource Planning$).$ Please list some of the hidden costs associated with ERP $($Enterprise Resource Planning$).$ As newly hired manager, you are asked to list some of the main advantages and disadvantages to MRP $($Material Requirements Planning$)$ system?$+++++++++++++++++++++++++++++$ Reflection$----$ Please tell us what did you learned and$/$or found interesting from completing this assignment.$$ Did you learn anything that you could use and$/$or benefit you in the future?