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Symptoms of Poor Inventory Management
Increasing number of back orders Increasing investment in inventory with backorders remaining constant High customer turnover rate Increasing number of orders cancelled Periodic lack of sufficient storage space Wide variance in turnover of major inventory items in distribution centers Deteriorating relationship with intermediaries, as typified by dealer cancellations and declining orders. Large quantities of obsolete items.
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Methods/Techniques of Inventory Reduction
Multiechelon inventory planning, ABC analysis Lead time analysis Elimination of low turnover & or obsolete item Analysis of pack sizes and discount structure Examination of procedures for returned goods Encouragement/Automation of product substitute Installation of formal reorder review systems Measurement of fill rates by skills Analysis of Customer demand characteristics Development of formal sales plan and demand forecast by predetermined logic Reengineering inventory management.
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Determining stock out cost Stt
Stock of costs occur when seller is unable to satisfy demand with available inventory, one of our possible events occur Customer waits until the product is available The customer back orders the product The Seller looses a sale The seller losses a customer Determining stock out cost Identify a stock out's potential consequences I.e. back order, lost sale, Lost customer Calculate each result’s expense or loss of profit and then to estimate the cost of single stock out. Assume that 70% of stock out results in back order and a back order results in extra handling cost. Say % result in lost sales for item Stt
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and this loss equals to $20 in lost profit margin; and 10% result in lost customer, or a loss of say $200. Calculate the overall impact, 70% of $ = $4.20 20% of $ = $4.00 10% of $ = $20.00 Total $28.20 Estimated cost per stock out. Since $ is the average dollar amount the firm can save by averting a stock out, the firm should carry additional inventory to protect against stock outs only as long as carrying additional inventory costs less than $
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Elements of Inventory Carrying Cost
Capital Costs Inventory Investment Insurance Inventory Service Costs Taxes Plant Warehouses Inventory Carrying Costs Public Warehouses Storage space Costs Rented Warehouses Company Owned WH Obsolescence Damage Inventory risk costs Shrinkage Relocation Costs
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Assumptions Inventory transfers between stocking locations at the same level are not common practice Lead times do not vary, and thus inventory concentration is not affected by inbound supply uncertainty. Customer service level, as measured by inventory availability, is constant regardless of the number of stocking locations. Demand at each location is normally distributed..
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A B C Analysis
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QR QR is effective for synchronizing product flow with information flow. Vendor commits to meet criteria as lead time, service levels & fill rates, EDI communication & possibly vendor managed inventory. Retailer commits to provide accurate timely demand information Performance criteria applied is precise.
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Elements of Q.R. Shorter, compressed time horizon Real time information available by S.K.U. Seamless, integrated logistic network that depend on rapid incoming transporting, strategic cross docking, and effective store receipt and distribution system Partnership relationship between manufacturers and retailers, including sharing of processes and information. Redesign of manufacturing operations and processes to reduce lot sizes and changeover times, enhance flexibility and responsiveness and coordinate MPS with forecasts and actual customer orders. Commitment to TQM, process improvement and ‘Service response logistics’.
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REVENUE LOSSES IN THE APPAREL PIPELINE (% RETAIL SALES)
Fibre&textile Apparel Retail Total Forced markedown 0.6% 4% 10% 14.6% stockouts 0.1% .4% 3.5% 1.0% 2.5% 2.9% 6.4% total 1.7% 6.9% 16.4% 25%
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Q R System 66 W Inventories Retail Apparel Textile 46 W Fibre
Weeks inventory 21 W Present Quick Very quick RWL/LV/PT-17
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Efficient Consumer Response
Report for the US Food Marketing Institute States:Today’s supply chain consists of a series of individual components, each pushing product to the next player in the supply chain.Each transaction adds substantial costs: selling expense, buying expense, purchasing ordering, order processing, order assembly, shipping, receiving, checking, put away, invoicing, paying,deducting, reconciling and more. Further, receivables average several weeks for each transaction. Very little, if any of these costs add value to the ultimate product or service the consumer receives.
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Efficient Consumer Response
The spirit of ECR has been captured by Birds Eye Wall’s,a Unilever frozen food company in the United Kingdom. It defines ECR as ‘the process which facilitates the true working together to achieve ultimate consumer satisfaction, maximizing business efficiency for mutual benefit’. The objective of ECR as defined by ECR Europe Conference in 1996, is “ to fulfill consumer wishes better, faster and at least cost.”Means Reduce Inventory thereby permitting price reductions or higher margins and secondly strengthen brand propositions that are compatible between manufacturer and retailer in order to meet consumer needs, thereby stimulating category growth and increasing revenue.
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The power of ECR lies in cooperation and the sharing of information and expertise between trading partners towards a common goal of increased consumer satisfaction. ECR is a tool for integrating separate aspects of supply chain to deliver increased value to the consumer ECR takes a process view, defining four core processes that span all supply chain players Research conducted by Anderson Consulting for ECR in 1997 found that most ECR related initiatives had centered around working together to reduce costs
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Retailer Wholesaler Introduce Product Promote Product Merchandise Products Replenish Products Manufacturer Supplier
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ECR Improvement concepts
Demand management Electronic Funds Transfer Item coding And database maintenance Electronic Data Interchange Supply management Integrated Suppliers Synchronized Production Continuous Replenishment Automated Store ordering Reliable operations Crossdocking
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Improvement Concepts Demand Management: which covers those activities focused on improving the product offering to consumers Supply management: which covers several initiatives designed to improve the flow of product through the supply chain Enabling Technologies: which are activities that act as enablers for the other ECR improvement concepts, many of which are related to electronic commerce
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For ECR to be successful
For ECR to be successful. Seven basic capabilities are required from manufacturing and retail firms. Integrated EDI Continuous Replacement Computer assisted ordering Flow through distribution Activity based costing Category Management – to optimize design, promotion, stocking etc. Flexible manufacturing – to match production with actual demand.
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Distributor Warehouse
Before ECR Supplier Warehouse 38 days Distributor Warehouse (Forward buy 9 days) turn inventory 31 days 40 days Retail store 26 days Consumer purchase Packing Line 104 days After ECR Distributor Warehouse 12 days Packing Line Supplier Warehouse 27 days Retail store 26 days Consumer purchase 61 days RWL/LV/PT-17
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Estimated ECR cost Reductions
Grocery Market Total Cost(US$bn) ECR Reduction Potential(% of Total costs) ECR reduction potential (Us $ bn) 491 5.5 % 26.9 18 6.2 % 1.1 307 6.3 % 19.3
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Estimated ECR Inventory Reductions
Grocery market average inventory(days) ECR reduction potential (%) ECR reduction potential (days) 43 42% 18 50 28% 14 104 41%
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BULLWHIP EFFECT 1. Information reduces inventory in supply chain
2. Information enables make better forecasts, accounting for promotions and market changes 3. Information results in coordination of manufacturing and distribution systems strategies. 4. Information enables retailers to better serve their customers by offering tools for locating desired items. 5. Information enables retailers to react and adapt to supply problems more rapidly. 6. Information enables lead time reduction. Increase in variability as we travel up in S.C. is referred to as “Bullwhip Effect”
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Variability of orders placed by customers
Variability of orders placed by retailers variability of orders placed by Distributors wholesaler is forced to carry more inventive as safety stock. Factory Distributor Wholesaler Retailer Customer Order Time Factors - Demand forecasting Lead time Batch ordering Price fluctuations, inflated order. RWL/LV/PT-17
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Order Point = L x AVG + Z. STD x L = Lead Time AVG = Average demand
STD = Standard deviation t = period Yt = µt.L + Z.Root L .St µt = average daily demand St = Standard deviation of daily demand t = period Retailer uses moving average technique P = observations RWL/LV/PT-17
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12 10 8 6 4 2 5 15 20 25 30 Variability P P - is large L - small
5 15 20 25 30 Variability P P is large L small Variability - Low L1 + L2 + L3 = 6 periods RWL/LV/PT-17
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Summary of Impact on Promotion Timing
Impact on timing of promotion Favours promotion during low demand periods. Favours promotion during peak demand periods. Favour promotion during low demand periods. -----” -----” Factor High forward buying High ability to steal market share High ability to grow overall market High margin Low margin High holding costs High costs of changing inventory
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RWL/LV/PT-17
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Guidelines for performance Improvement
Maintain inventory at four-month level during current year. Reduce to three months level over the course of next two years. Establish & maintain a customer service level of 92% product availability for all regular line items & have such items ready for shipment within five days of receipt of order. Develop procedures to maintain logistics operating expenses at 3.5% of sales during current year. Reduce transportation expenses, including private fleet, to 2.5% of sales during current year, & reduce them to 2.4% next year. Reduce freight shipment damage rate to 1% of total sales. Maintain employee turnover rate at 12% per year. Achieve and/or exceed overall satisfaction objectives.
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