Definition: The optimal order lot is the amount of product that must be ordered to optimally satisfy the current level of demand.

The size of the optimal order lot depends on a large number of factors:

• Demand for goods (demand for goods among buyers);
• order period;
• Remaining stock;
• Insurance stock;
• Frequency of deliveries;
• Minimum lot of the order;
• Multiplicity of deliveries;
• Service level, %;
• Expiration date (when ordering, you need to take into account the risk of delay of the goods)

In general, the optimal order lot is the difference between the optimal stock for the delivery period (how much you need to store the goods to meet demand) and the balance of the goods (what will be the balance of the goods on the delivery date).

The main factor influencing the volume of the order is the demand for the product.

Model of the optimal order lot on the example in the Forecast NOW!

For example, a product was sold in quantities of 50 pieces. per week, but due to the increase in prices, the demand for it decreased to 40 pcs. in Week. Accordingly, the optimal inventory and the optimal order lot can be reduced based on these changes.

Forecast NOW! allows you to take into account changes in demand and many other factors affecting the order. In this case, all formulas are calculated automatically, you only need to check and change the necessary parameters.

Let's take a step-by-step look at how you can take into account the factors that affect the model of the optimal order lot in the Forecast NOW! :

Step 1. We go to the "Parameters" tab and check the parameters we need for the goods for the order or change individual parameter indicators.

The Options tab has 6 sections:

• Main parameters,
• Delivery features,
• Delivery schedule,
• forecasting,
• seasonality,
• Trend.

Step 2 Adding desired goods, whose parameters we want to check or change.

The green arrow in the figure below indicates the addition of the product. Further, the parameter - expiration date is marked with a red arrow. This parameter, as well as others, can be changed if necessary. For example, for the test item "Breakfast Cookies", we will set the expiration date to 7 days (red arrow). If this parameter value needs to be entered for all products added to the table, then you must click on the "Apply to all" button (blue arrow).

With a set expiration date, the program will not order more goods than the optimal demand for this period (in the example for "Biscuits for breakfast" - 7 days)

Step 3 Go to the next tab - "Peculiarities of deliveries". In the same way, we look through the parameters and note what needs to be taken into account in calculating the batch size of the optimal order.

Here you can, for example, set the supplier's restrictions on the multiplicity (if the goods can be ordered only in batches certain size) and the minimum order quantity.

For seasonal goods it is necessary to set the parameters in the "Seasonality" tab in the calculation of the optimal batch of the order.

Seasonality is best calculated for a group of products with similar seasonality:

If the demand for goods changes predictably, but is not related to seasonality, then you need to mark the parameters in the "Forecast" and "Trend" tabs.

Let's check how changing the parameters affects the size of the optimal order. To begin with, we will not take into account any additional parameters, go to the "Order" tab and create an order.

Select the desired products and click "Place an order".

There are three products in the order: Marmalade "Little Princess", Zephyr and Waffles. The program calculated that this moment it is necessary to order only chocolate wafers in the amount of 29 units. Now let's go to the "Parameters" tab and see what these items are taken into account in the calculation and what needs to be taken into account.

In the main parameters, put down the expiration date of the products (red arrow) and add this parameter to the calculated ones by checking the box above the desired column and clicking on the "Apply to all" button.

Go to the next tab "Features of deliveries". Let's pay attention to such parameters as the minimum stock, which is necessary in order to limit the system, and even in the absence of demand for a product, maintain a stock and multiplicity for it.

Now let's see how the optimal order size for these products changes based on the new parameters. To do this, go to the "Order" tab and again create an order.

The volume of the order has changed. Order options have changed. Before the introduction of new parameters, it was required to order only Wafers in the amount of 29 units, now the order includes Wafers - 28 units (The order has been rounded up). and Zephyr in the amount of 35 pack.

Automatic calculation of the optimal order, taking into account all the necessary parameters, ensures that there is no excess of goods in the warehouse, and demand will always be maintained at the required level. By adjusting the different conditions of supply, demand and storage of goods, you can automatically adjust the size of the optimal order lot.

Workshop on the topic "Types of logistics and areas of its use"

Determination of the optimal order size

Guidelines

When determining optimal size order (delivery line) as a criterion of optimality choose the minimum total cost of delivery and storage.

where C total - total costs for transportation and storage;

From storage - the cost of storing the stock;

With transp - transportation costs.

Creation of redundant inventory increases the costs of their storage, and their irrational reduction entails an increase in the frequency of smaller shipments, which significantly increases the cost of delivering goods.

The optimal order size (delivery batch) and, accordingly, the optimal delivery frequency depend on the following factors: the volume of demand (turnover); expenses for the delivery of goods; inventory holding costs.

Suppose that for a certain period of time T, the turnover is Q. The size of one batch ordered and delivered is S. Suppose that a new batch is imported immediately after the previous one has completely ended, then the average stock will be S / 2. The cost of storing goods for a period of time T will be:

,

where M is the cost of storing a unit of stock for period T.

The cost of transportation for the period T is determined by multiplying the number of deliveries (orders) for this period by the cost of supplying one consignment of goods.

where K is the cost of importing one consignment of goods;

Q/S - the number of deliveries for a period of time T.

After a series of transformations, the optimal size of the delivery (order) batch (S opt) is determined. The resulting formula in inventory management theory is known as Wilson's formula .

where Q is the planned volume of trade (annual volume of demand);

K - the costs of fulfilling one order (delivery), including the costs of placing one order (clerical work, administrative expenses, etc.), the costs of delivery and acceptance of a consignment of goods;

M is the cost of storing a unit of production.

Example:

Annual need for a component product - 2000 pcs.

The cost of fulfilling one order is 400 rubles.

The unit price of a component product is 200 rubles.

Determine the optimal order quantity.

The calculation is made for different values ​​of the order quantity (selection is free). According to the above formulas, we calculate the transportation, procurement and storage costs per unit of production. Summing them up, we determine the total costs. The smallest value corresponds to the optimal order quantity - 200 pcs.

order	Number of deliveries	Costs for acquisition per unit prod.	Warehouse costs / units prod.	Total supply costs / unit prod.
S	Q/S
50	40	8	0,5	8,5
100	20	4	1	5
200	10	2	2	4
400	5	1	4	5
100	2	0,4	10	10,4
2000	1	0,2	20	20,2

The result is checked according to the Wilson formula.

EXERCISE 1

The enterprise has an annual need for product A in the amount of 1500 pieces. The price of product A is 300 rubles / unit. The cost of fulfilling one order is 200 rubles. for one order. The company calculates the rate of storage costs and interest rate in the amount of 20%.

Exercise:

• Produce necessary calculations and complete the table below.
• Represent in graphical form functions of all costs (transport, storage, general) per unit of production (on the X axis - the order volume, on the Y axis - the cost per unit of production).
• What is the optimal order quantity for this example? Do the calculation using the Wilson formula.

order	Number of deliveries	Costs for acquisition per unit prod.	Warehouse costs / units prod.	Total supply costs / units prod.

TASK 2

The department store plans to sell 2,500 wall clocks a year. The cost of organizing the purchase, negotiations, delivery, acceptance of goods, etc., is 25 c.u. e. per one delivered batch. The cost of storing a unit of production - 0.4 conv. units

Determine the optimal order size.

How many times will it be necessary to import goods during the year?

TASK 3

The monthly turnover for heading A is 40 thousand rubles. The cost of storing a unit of goods for a month is 0.1 thousand rubles. Delivery costs for one consignment of goods - 0.5 thousand rubles.

Determine the optimal delivery lot size.

How many times per month will goods be imported?

What will be the total costs of the enterprise, subject to the optimal size of the delivery lot?

How will the monthly expenses of the enterprise for transportation and storage change if the delivery lot increases or decreases by 25%?

Determining the location of the distribution warehouse

Guidelines

When calculating, transport costs for the delivery of goods from the distribution warehouse to the chain stores are taken into account. The amount of transport costs depends not only on the number of stores in trading network, but also on the location of the distribution warehouse in the service area.

To solve problems of this kind, various methods have been developed, the main of which are: the exhaustive search method, heuristic methods, the method for determining the center of gravity of the physical model of the distribution system.

The task of interest to us is to determine the location of the distribution warehouse. The application of the method has one limitation - the distances between the points of consumption of the material flow and the location of the distribution warehouse are measured in a straight line.

The coordinates of the center of gravity of cargo flows (X warehouse, Y warehouse), that is, the point at which a distribution warehouse can be located, are determined by the formulas:

where ri is the cargo turnover of the i-th consumer;

Xi, Yi – coordinates of the i-th consumer;

n is the number of consumers.

Example:

Using the method of determining the center of gravity, solve the problem of optimizing the placement of a distribution center serving a supermarket chain. There are coordinates of their location in the service area and cargo turnover.

Determine the location of the warehouse.

The initial data and the results of the calculation should be shown graphically.

Name	Location coordinates, km (X;Y)	cargo turnover,
Supermarket №1
Supermarket №2
Supermarket №3
Supermarket №4
Supermarket №5

TASK 4

A wholesale company that sells rolled metal serves industrial enterprises cities, among which 9 regular customers. It is necessary to determine the location of the wholesale base. Service zone wholesale company– 60 km. The coordinates of the location of consumer enterprises (X, Y) in the serviced territory and data on cargo turnover are presented in the table.

Name enterprises	Location coordinates of the enterprise, km (X; Y)	cargo turnover,
Enterprise No. 1
Enterprise №2
Enterprise No. 3
Enterprise №4
Enterprise No. 5
Enterprise No. 6
Enterprise №7
Enterprise No. 8
Enterprise No. 9

Put on the map of the service area the coordinate axes and coordinates of the points where the enterprises are located.

Determine a point where a wholesale base can be placed and plot it on the map.

TASK 5

There are 7 shops in the district selling building materials. Using the method of determining the center of gravity of cargo flows, find an approximate location for the location of a warehouse supplying stores.

The initial data for the calculation are given in the table.

Find the coordinates of the point (X warehouse, Y warehouse), where it is recommended to place a distribution warehouse.

Before starting the calculation, put on paper the coordinates of the placement of stores on the X and Y axes. Show the result on the drawing.

Shop number	Location coordinates store, km (X; Y)	cargo turnover,

Comparison of different modes of transport

TASK 6

Rank different types of transport in the context of the main factors influencing their choice.

Put down the rank from 1 to 5, considering "1" as the best value.

transport Factor	Railway		Automobile	Pipeline	Air
delivery
departures
Reliability compliance delivery
Ability transport various
Ability deliver the goods to any point territory
Price transportation

print version

Stocks play both a positive and a negative role in the activity logistics system. The positive role lies in the fact that they ensure the continuity of the processes of production and marketing of products, being a kind of buffer that smooths out unforeseen fluctuations in demand, violation of the timing of the supply of resources, and increases the reliability of logistics management.

The negative side of the creation of stocks is that they immobilize significant financial resources, which could be used by the enterprise for other purposes, for example, investments in new technologies, market research, improvement economic indicators enterprise activities.

In addition, large stock levels finished products impede the improvement of its quality, since the enterprise is primarily interested in the sale of existing products before investing in improving its quality. Based on this, the problem arises of ensuring the continuity of logistics and technological processes at minimum level costs associated with the formation and management various types inventory in the logistics system.

One of the methods of effective inventory management is the determination of optimal consignments of cargo, which allows you to optimize the cost of transportation, storage of cargo, as well as to avoid excess or shortage of cargo in the warehouse.

Optimal lot size q is determined by the criterion of minimum costs for transportation of products and storage of stocks.

The amount of total costs is calculated by the formula (3.1):

where n is the number of batches delivered during the billing period

where is the average value of the stock (in tons), which is determined on the assumption that a new batch is imported after the previous one is completely used up.

In this case, the value is calculated using the following formula:

The total cost function C has a minimum at the point where its first derivative with respect to q equals zero, i.e.

As the size of the annual consumption of products, we accept the data obtained as a result of forecasting by the regression analysis method: thousand tons / year; tariff for the transportation of one consignment c.u./t; costs associated with the storage of stock c.u./t.

Substituting the given values, we get:

In this case, the total costs will be:

Solution to this problem graphically consists in plotting dependencies , and , having previously performed the necessary calculations to determine , and .

Let's define the value , and when changing q in the range from 900 to 800 with a step of 1200. The result of the calculations will be entered in Table 3.1.

Table 3.1.

Values ​​, and

Lot size, q Costs, c.u.
	6171,75		4937,4	4488,55	4114,5
	10171,75		9937,4	9988,55	10114,5

According to table 3.1, graphs of the dependence of costs (transport, storage and total) on the size of the lot were plotted (Fig. 3.1).

Figure 3.1 Dependence of costs on lot size

An analysis of the graphs in Figure 3.1 shows that transportation costs decrease with increasing lot size, which is associated with a decrease in the number of flights. Storage costs increase in direct proportion to lot size.

The total cost schedule has a minimum at the value q approximately equal to 993 tons, which is the optimal value of the size of the delivery lot. The corresponding minimum total costs are $9937.

Let's calculate the optimal batch size under shortage conditions with the amount of expenses associated with the shortage

In conditions of shortage, the value calculated by formula (3.8) is corrected by the coefficient k, which takes into account the costs associated with the deficit.

The amount of spending associated with the deficit;

accept

Substituting the values, we get:

K=

It follows from this that in conditions of a possible shortage, the size of the optimal delivery lot must be increased by 15%.

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• 2. Practical part
• Task 1
• Task 2
• Task 3
• Task 4

1. Determination of the optimal order size

volume of demand (turnover);

transportation and procurement costs;

inventory holding costs.

As an optimality criterion, choose the minimum amount of costs of transport and procurement and storage.

Transport and procurement costs decrease with an increase in the size of the order, since the purchases and transportation of goods are carried out in larger lots and, therefore, less frequently.

Storage costs increase in direct proportion to the size of the order.

To solve this problem, it is necessary to minimize the function representing the sum of the costs of transport and procurement and storage, i.e. determine the conditions under which

Common \u003d Save + Transp,

where Сtot is the total cost of transportation and storage; Store - the cost of storing the stock; Stsp - transport and procurement costs.

Suppose that for a certain period of time, the turnover is Q. The size of one ordered batch S. Let's say that a new batch is imported after the previous one has completely ended. Then the average value of the stock will be S / 2. Let's introduce the tariff (M) for the storage of goods. It is measured by the proportion of the cost of storage for the period T in the value of the average inventory for the same period.

The cost of storing goods for period T can be calculated using the following formula:

Save = M (S / 2).

The amount of transport and procurement costs for the period T will be determined by the formula:

Store = K (Q/S)

where K - transportation and procurement costs associated with the placement and delivery of one order; Q/S - number of orders for a period of time. Substituting the data into the main function, we get:

So6sch \u003d M (S / 2) + K (Q / S).

The minimum Ctot is at the point where its first derivative with respect to S is equal to zero, and the second derivative is greater than zero.

Let's find the first derivative:

Once the choice of a replenishment system has been made, it is necessary to quantify the size of the ordered batch, as well as the time interval through which the order is repeated.

The optimal batch size of the delivered goods and, accordingly, the optimal frequency of importation depend on the following factors:

volume of demand (turnover);

shipping costs;

inventory holding costs.

As an optimality criterion, a minimum of total costs for delivery and storage is chosen.

Rice. 1. Dual bin inventory control system

The graph of this dependence, which has the form of a hyperbola, is shown in Fig.1.

Both shipping costs and storage costs depend on the size of the order, however, the nature of the dependence of each of these cost items on the volume of the order is different. The cost of delivery of goods with an increase in the size of the order obviously decreases, since shipments are carried out in larger consignments and, therefore, less frequently.

The graph of this dependence, which has the form of a hyperbola, is shown in Fig. 2.

Storage costs increase in direct proportion to the size of the order. This dependence is graphically presented in fig. 3.

Rice. 2. Dependence of transportation costs on the size of the order

Rice. 3. The dependence of the cost of storing stocks on the size of the order

Adding both graphs, we get a curve that reflects the nature of the dependence of the total costs of transportation and storage on the size of the ordered lot (Fig. 4). As you can see, the total cost curve has a minimum point at which the total cost will be minimal. The abscissa of this point Sopt gives the value of the optimal order size.

Rice. 4. Dependence of the total cost of storage and transportation on the size of the order. Optimal order size S opt

Thus, the problem of determining the optimal order size, along with the graphical method, can also be solved analytically. To do this, you need to find the equation of the total curve, differentiate it and equate the second derivative to zero.

As a result, we obtain a formula known in the theory of inventory management as the Wilson formula, which allows us to calculate the optimal order size:

where Sopt - the optimal size of the ordered lot;

O - turnover value;

St - the costs associated with delivery;

Сх - costs associated with storage.

The resulting formula, which allows you to calculate the optimal order size, is known in the theory of inventory management as the Wilson formula.

The task of determining the optimal order size can be solved graphically and analytically. Consider the analytical method.

"To do this, it is necessary to minimize the function representing the sum of transportation and procurement costs and storage costs from the size of the order, i.e. to determine the conditions under which:

With total = From storage + transp. Min

where, C total. - the total cost of transportation and storage of the stock;

From storage - the cost of holding stock;

With transp. - transportation and procurement costs.

Suppose that for a certain period of time the turnover is Q. The size of one batch ordered and delivered is S. Let's say that a new batch is imported after the previous one has completely ended. Then the average value of the stock will be S / 2.

Let's introduce the size of the tariff M for stock storage. M is measured by the share that storage costs for period T make up in the cost of the average stock for the same period. For example, if M = 0.1, then this means that the cost of holding the stock for the period amounted to 10% of the cost of the average stock for the same period. We can also say that the cost of storing a unit of goods during the period amounted to 10 5 of its value.

Now you can calculate how much it will cost to store goods for period T:

From storage = M x S/2

The amount of transportation and procurement costs for period T is determined by multiplying the number of orders for this period by the amount of costs associated with the placement and delivery of one order.

With transp. = K x Q/S

Where

K - transportation and procurement costs associated with the placement and delivery of one order; Q/S - the number of deliveries for a period of time.

Having performed a number of transformations, we will find the optimal size of a one-time delivered lot (S opt.), at which the total cost of storage and delivery will be minimal.

With total = M x S/2 + K x Q/S

Next, we find the value of S, which turns the derivative of the objective function to zero, from which a formula is derived that allows you to calculate the optimal order size, known in inventory management theory as the Wilson formula.

Consider an example of calculating the optimal size of the ordered batch. We take the following values ​​as initial data. The cost of a unit of goods is 40 rubles. (0.04 thousand rubles).

Monthly warehouse turnover for this item: Q = 500 units/month. or Q = 20 thousand rubles. /month The share of costs for storing goods is 10% of its value, i.e. M = 0.1.

Transport and procurement costs associated with the placement and delivery of one order: K = 0.25 thousand rubles.

Then the optimal size of the imported lot will be:

Obviously, it is advisable to import goods twice a month:

20 thousand rubles / 10 thousand rubles = 2 times.

In this case, transport and procurement costs and storage costs:

With total \u003d 0.1 H 10/2 + 0.25 H 20/10 \u003d 1 thousand rubles.

Ignoring the results obtained will lead to inflated costs.

An error in determining the volume of the ordered batch by 20% in our case will increase the monthly costs of the enterprise for transportation and storage by 2%. This is commensurate with the deposit rate.

In other words, this mistake is tantamount to the unacceptable behavior of a financier who kept money without movement for a month and did not allow them to "work" on a deposit."

The reorder point is determined by the formula:

Tz \u003d Rz x Tc + Zr

where, Pz is the average consumption of goods per unit of order duration;

Tc - the duration of the order cycle (the time interval between placing an order and receiving it);

Зр - the size of the reserve (guarantee) stock.

Consider an example of calculating the reorder point.

The company buys cotton fabric from a supplier. The annual volume of fabric demand is 8,200 m. We assume that the annual demand is equal to the volume of purchases. At the enterprise, the fabric is consumed evenly, and a reserve supply of fabric equal to 150 m is required. (Assume that there are 50 weeks in a year).

The average consumption of fabric per unit of order duration will be:

Rz = 8200 m. / 50 weeks = 164 m.

The reorder point will be equal to:

Tz \u003d 164 m. X 1 week. + 150 m. = 314 m.

This means that when the level of stock of fabric in the warehouse reaches 314 m, the next order should be made to the supplier.

It is worth noting that many enterprises have accessible and very important information that can be used in the control of inventories. Grouping of material costs should be carried out for all types of inventory in order to identify the most significant among them.

As a result of ranking by cost certain types raw materials and materials among them, a specific group can be distinguished, the control over the state of which is of paramount importance for the management working capital enterprises. For the most significant and expensive types of raw materials, it is advisable to determine the most rational order size and set the value of the reserve (insurance) stock.

It is necessary to compare the savings that can be obtained by the enterprise due to the optimal order size, with additional transport costs arising from the implementation of this proposal.

For example, the daily supply of raw materials and materials may require the maintenance of a significant fleet of trucks. Transportation and operating costs can exceed the savings that can be obtained by optimizing the size of stocks.

transportation size order commodity

At the same time, it is possible to create a consignment warehouse of used raw materials near the enterprise.

In the management of stocks of products in a warehouse, the same techniques can be used as in the management of goods and materials, in particular the ABC method.

With the help of the methods presented above, as well as on the basis of an analysis of consumer requests and production capabilities, the most rational schedule for the receipt of finished products at the warehouse and the size of the safety stock can be determined.

The costs of storage, accounting and other costs associated with ensuring the rhythm of the supply of manufactured products must be weighed against the benefits that come from the uninterrupted supply of traditional buyers and the fulfillment of periodic urgent orders.

2. Practical part

Task 1

Plot an ABC analysis curve for the following set:

Let's sort all the objects in the table according to the share of the object in the total contribution, while calculating the share of the object on an accrual basis. We divide all materials into groups as follows: objects belong to group A, while specific gravity cumulative total will not reach 80%; in group B - 95%, the rest of the objects will be assigned to group C.

ABC analysis

primary list	ordered list
object number	Object Contribution		item number	Object Contribution	The share of the object in the total contribution,%	Share of cumulative total, %

Task 2

The annual demand is D units, the cost of placing an order, rubles/order, the purchase price, C rubles/unit, the annual cost of storing one unit is a % of its purchase price. Delivery time 6 days, 300 working days a year. Find the optimal order level, costs, reorder level, number of cycles per year, distance between cycles. Compare two models: the main one and the one with a deficit (bids are fulfilled).

1) The basic model of inventory management.

Optimal order level:

Thus, during each order cycle, it is necessary to place an order for 86 units of products.

The annual total variable cost of orders is determined according to the formula:

The sales volume for 6 days of delivery will be:

Reorder level 16 units.

That is, new stock is supplied when the stock level is 16 units. Number of cycles per year

Distance between cycles

2) Consider a model with a deficit (orders are fulfilled).

Planned deficit

Optimal order level:

In this situation, it is necessary to submit orders of 116 units.

Maximum deficit:

The total variable cost per year is defined as follows:

Compared to the basic model, the savings are

1396.42-1073.26 = 323.16 rubles per year.

Thus, if we use the deficit planning model, then we can achieve savings in the total variable cost of inventory, equal to 323.16 rubles per year.

Task 3

The table shows the coordinates of eight consumers, the monthly turnover of each of them is indicated. Find the coordinates of the supply center.

consumer number	X coordinate	Y coordinate	Cargo turnover

We will solve the problem of choosing the location of the supply center for distribution system including one supply center. The main factor influencing the choice of the location of the supply center is the size of the cargo turnover of each of the eight consumers. Costs can be minimized by placing a supply center in the vicinity of the center of gravity of cargo flows.

Coordinates of the center of gravity of cargo flows (X center, Y center), i.e. - the points where the distribution warehouse can be located are determined by the formulas:

where G i g freight turnover of the i-th consumer;

Xi, Yj are the coordinates of the i-th consumer.

The point of the territory, which provides a minimum of transport work for delivery, in the general case does not coincide with the found center of gravity, but, as a rule, is located somewhere nearby. To select an acceptable location for the supply center will allow the subsequent analysis of possible locations in the vicinity of the found center of gravity. At the same time, it is necessary to evaluate transport accessibility terrain, the size and configuration of the potential site, and the plans of the local authorities for the intended area.

Let's make a drawing for the task.

Find the coordinates of the center of gravity of cargo flows.

X center = 21.7

Y center = 17

Let's put a point with such coordinates on the drawing.

Task 4

Select a supplier if the dynamics of prices for the supplied goods is known. The data are given in the table.

Dynamics of prices for supplied goods

Price growth rate for i-th variety goods from the j-th supplier

where C ij2 is the price of the i-th product from the j-th supplier in the second quarter;

C ij1 - the price of the i-th product from the j-th supplier in the first quarter.

Under the conditions of this problem, for the first supplier for goods A, B and C, respectively

For the second supplier for goods A, B and C, respectively

The share of the i-th product in the total supply of the j-th supplier

where S ij is the amount for which the goods of the i-th type j-th supplier

G ij - the volume of supply of goods of the i-th type by the j-th supplier;

УS ij - the amount on which all goods j supplier.

The share of goods of type A in the total supply of the first supplier

The share of goods of type B in the total supply of the first supplier

The share of goods of type C in the total supply of the first supplier

The share of goods of type A in the total supply of the second supplier

The share of goods of type B in the total supply of the second supplier

The share of goods of type C in the total supply of the second supplier

The weighted average price growth rate of the j-th supplier

Then the weighted average price growth rate of the first supplier.

The weighted average price growth rate of the second supplier.

The growth rate of the price reflects the increase negative characteristic supplier, so preference should obviously be given to one of them whose rating is lower. In this example, supplier #1 should be preferred.

List of used literature

1. Anikin, B.A. Logistics: Textbook [Text] / B.A. Anikin. M.: INFRA - M, 2008.

2. Gadzhinsky, A.M. Logistics: Textbook [Text] / A.M. Gadzhinsky - M.: "Dashkov and Co", 2008. - 484 p.

3. Nerush, Yu.M. Logistics: Textbook [Text] / Yu.M. Nerush. - M.: Prospekt, TK Velby, 2008. - 520 p.

4. Workshop on logistics / Ed. B.A. Anikina. - M.: INFRA - M, 2007. - 280 p.

5. Chudakov, A.D. Logistics [Text]: Textbook / A.D. Chudakov. - M.: RDL Publishing House, 2003. - 480 p.

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term paper, added 01/18/2015


What is insurance stock. Varieties and features of their creation. The optimal size of stocks, the organization of control over their actual state. Choice of inventory control system, its main characteristics. Order planning.

term paper, added 01/25/2010


Essential characteristic and basic elements of inventory management. Model and formula of the optimal order size (Wilson model). Classification of types of demand. Static and dynamic models of inventory management, their features and characteristics.

control work, added 03/18/2012


Features of storage of goods in a warehouse, warehouses of trade organizations. The obligation of storage, depending on the relationship of the parties, the form of the storage agreement. Storage of material assets of the state reserve and responsible storage.

abstract, added 12/18/2009


Definition of market boundaries for three freight forwarding firms and calculation of material flows. A characteristic of the optimal supply lot size and the best supplier based on the rating calculation. Choice best system product distribution.

test, added 01/18/2010


Inventory management as a basic logistics function of commodity supply. Comparative characteristics basic systems inventory management. ABC-analysis of materials purchased by the enterprise for production and determination of the optimal order size.