Inventory 库存. Contents  Reasons for holding inventory  Types of inventory  Inventory cost  Inventory management.

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Presentation transcript:

Inventory 库存

Contents  Reasons for holding inventory  Types of inventory  Inventory cost  Inventory management

Reasons for holding inventory  (1)it enables the firm to achieve economies of scale;  (2)it balances supply and demand;  (3)it enables specialization in manufacturing;  (4)it provides protection from uncertainties in demand and order cycle;  (5)it acts as a buffer.

Economies of scale  Purchasing  Transportation  manufacturing

Balancing supply and demand  Seasonal supply and/or demand  Demand for a product may be relatively stable throughout the year, but raw materials may be available only at certain times during the year. such is the case for producers of canned fruits and vegetables.

specialization  Large quantities of production  Volume transport rate

Protection from uncertainties  Raw materials inventory  Work-in-process inventory  Finished goods inventory

Inventory as buffer  Supplier-procurement  Procurement-production  Production-marketing  Marketing-distribution  Distribution-intermediary  Intermediary-consumer/user

Types of inventory  Cycle stock  In-transit inventory  Safety or buffer stock  Speculative stock  Seasonal stock  Dead stock

Cycle stock  Cycle stock is inventory that result from the replenishment process and is required in order to meet demand under conditions of certainty-that is, when the firm can predict demand and replenishment times (lead times) perfectly.

Safety or buffer stock  Safety or buffer stock is held in excess of cycle stock because of uncertainty in demand and/or in lead time  Average inventory=1/2Q+safety stock

In transit inventory  In transit inventories are items that are en- route from one location to another. They may be considered part of cycle stock even though they are not available for sale and or shipment until after they arrive at the destination.

Speculative stock  It is inventory that held for reasons other than satisfying current demand.

Seasonal stock  It is a form of speculative stock that involves the accumulation of inventory before a season begins in order to maintain a stable labor force and production runs, etc..

Dead stock  Dead stock is items for which no demand has been registered for some specific period of time. (on a total company basis or just at one stock-keeping location)

Inventory cost  Reasons of importance. (page 208)  It includes carrying cost and order cost.  Carrying cost: capital cost; storage cost; inventory service cost; inventory risk cost.  Order/setup cost: order cost; setup cost.

Inventory management  Under condition of centainty  The best ordering policy can be determined by minimizing the total of inventory carrying costs and ordering costs using the economic order quantity(EOQ) model.