Impact of Product Classes on Logistics Plans and Decisions Consumer Goods Convenient Goods Shopping Goods Specialty Goods Industrial Goods
Product Characteristics Impacts on Planning Product life cycle 80-20 rule Individual characteristics: Weight-Bulk ratio (ration of weight to volume, density; e.g. cotton vs. steel) Value-Weight ratio (coal vs. jewelry) Substitutability (customer’s reaction when not in stock) Risk characteristics (perishability, flammability, ease of being stolen)
Product Life Cycle Sales Volume Time Introduction Maturity Growth Decline
80-20 Rule and ABC Classification
The 80-20 curve with an Arbitrary Product Classification Total Sales(%) Total Items(%) A C B 20 50
ABC Analysis Divides on-hand inventory into 3 classes A class, B class, C class Basis is usually annual $ volume $ volume = Annual demand x Unit cost Policies based on ABC analysis A items receives wide geographic distribution through many warehouses, with high levels of stock availability Give tighter physical control of A items Forecast A items more carefully C items might be distributed from a single, central stocking point(e.g. plant), with lower total stocking levels than for the A items B items would have an intermediate distribution strategy where few regional warehouses are used © 1998 by Prentice Hall, Inc. A Simon & Schuster Company Upper Saddle River, N.J. 07458 Transparency Masters to accompany Operations Management, 5E (Heizer & Render) 12-13 13
Inventory Value of the Products in a Warehouse 80-20 rule and ABC analysis can be used as the basis of grouping the products in a warehouse y= (1+A)x A+X where, Y= Fraction of cumulative sales X= Fraction of items A: constant to be determined If the relation between X and Y is already known: A= X(1-Y) (Y-X)
Product Characteristics Weight- Bulk Ratio Value-Weight Ratio Substitutability Risk Characteristics
Logistics Cost as a percentage of sales price Increasing Weight-bulk ratio Logistics Cost as a percentage of sales price Storage Cost Transportaiton Cost Total Cost Generalized Effect of Product Density on Logistics Cost
Logistics Cost as a percentage of sales price Generalized Effect of Value-weight Ratio on Logistics Cost Increasing value-weight ratio Logistics Cost as a percentage of sales price Transportation cost Storage Cost Total Cost
Effect of Improved Transportation on Logistics Cost for a given level of substitutability Improved transportation service Storage Cost Lost Sale cost Transport cost Total cost Logistics cost as a percent of price
Effect of Average Inventory Level on Logistics Cost for a Given Level of Substitutability tics cost as a percentage of price Transportation cost Lost Sale cost Storage cost Total cost
Generalized Effect of Product Risk On Logistics Cost Increasing Level of Risk of the Product Costs Storage Cost Transportation Cost Total Cost