Question 2: How do we make decisions about inventory?
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1 uestion : How do we make decisions about inventory? Most businesses keep a stock of goods on hand, called inventory, which they intend to sell or use to produce other goods. Companies with a predictable demand for a good throughout the year are able to meet the demand by having an adequate supply of the good. A large inventory costs money in storage cost and carrying low inventory subjects a business to undesirable shortages called stockouts. A company s inventory level seeks to balance the storage cost with costs due to shortages. A light emitting diode (LED) is a light source that is used in many lighting applications. In particular, LEDs are used to produce very bright flashlights used by law enforcement, fire rescue squads and sports enthusiasts. Suppose a manufacturer of LED flashlights needs 100,000 LED bulbs annually for their flashlights. Figure 1 Inventory levels at the manufacturer over a one year period. In (a), all bulbs are made at the beginning of the year and used at a constant rate throughout the year. In (b), two batches of 50,000 are made. In (c), 4 batches of 5,000 are made. In (d), 8 batches of 1,500 are made. In each case, when the inventory reaches 0, the next batch is manufactured instantaneously. The company may manufacture all of the LED bulbs at one time or in smaller batches throughout the year to meet its annual demand. If the manufacturer makes all of the 15
2 bulbs at one time they will have a supply to make flashlights throughout the year, but will need to store bulbs for use later in the year. On the other hand, if they make bulbs at different times throughout the year, the factory will need to be retooled to make each batch. Since the manufacturer does not need to make LED bulbs continuously throughout the year, they will use the manufacturing capacity for other purposes during the rest of the year. When they do manufacture the bulbs, the factory will need to be set up for this purpose. For this manufacturer, it costs $5000 to set up the factory to manufacture LED bulbs. This amount covers all costs involved in setting up the factory such as retooling costs, diminished capacity while the production line is retooled, and labor costs. Each time the company manufactures a batch of bulbs, they incur this cost. Obviously, the more times the plant retools, the higher the total cost is. The company pays a holding cost to store any LED bulbs not used. The holding cost includes the taxes, insurance, and storage costs that change as the number of units stored changes. If they manufacture all of the bulbs at one time, they will have to store more bulbs throughout the year. For this manufacturing plant, it costs $1 to hold a bulb for one year. We ll assume that the company s production cost does not change throughout the year. In other words, whether they manufacture the bulbs all at once or in several batches throughout the year, it will cost them the same amount per unit to manufacture the bulbs. For this plant, it costs $5 to manufacture an LED bulb. The total cost for the manufacturer is the sum of the set up, holding and production costs. For other manufacturers, other costs may be included in this sum. However, we ll assume that the total cost for this plant is restricted to these three costs. If they produce more LED bulbs in each batch, the set up costs will be lower but they will pay a higher holding cost. On the other hand, if they produce fewer bulbs in each batch they will lower the holding cost. This decrease in holding cost is accompanied by an increase in the set up cost since more batches will be needed to meet the annual demand. The manufacturer faces a simple question: how many units should they manufacture in each 16
3 batch so that their total cost is minimized? The batch size that results in the lowest total cost is called the economic lot size. Example 3 Find the Economic Lot Size A manufacturing plant needs to make 100,000 LED bulbs annually. Each bulb costs $5 to make and it costs $5000 to set up the factory to produce the bulbs. It costs the plant $1 to store a bulb for 1 year. How many bulbs should the plant produce in each batch to minimize their total costs? Solution To find the economic lot size, we need to analyze the costs for the plant and model these costs. What kind of costs will be incurred? Three different types of costs are described in this example. A set up cost of $5000 is incurred to set up the factory. A production cost of $5 per bulb is incurred for labor, materials, and transportation. Since the demand for bulbs occurs throughout the year, we ll need to store some of them in a warehouse at a holding cost of $1 per bulb for a year. Let s try to solve this naively and simply produce all 100,000 bulbs in one batch. Figure - If all of the LED bulbs are produced in one batch, the average inventory is 50,000 bulbs. 17
4 If the demand throughout the year is uniform, we can expect to have an average inventory of 100, average inventory 50,000 It will cost $1 to store each of these bulbs for holding costs of 50,000 $1 or $50,000. If all of the bulb are produced in one batch, the production line will need to be set up once for a cost of $5000.To produce 100,000 bulbs at a cost of $5 per bulb will cost 100,000 $5 or $,500,000. The total cost to produce one batch of 100,000 bulbs is the sum of these costs, Total , ,000 1,555,000 set up production holding The largest cost in this sum is the production cost. If the cost to make a bulb is fixed and we don t change the number of bulbs produced each year, changing the batch size won t affect this term. We can lower the holding cost by producing fewer bulbs in each batch. But this increases the set up cost since the production line will need to be set up more often. Figure 3 -If the LED bulbs are produced in two batches, the average inventory is reduced to 5,000 bulbs. 18
5 If the batch size is reduced to 50,000, the average inventory is reduced to 50, average inventory 5,000 for storage costs of 5,000 $1 or $5,000. The production line will need to be set up twice at a cost of $5000 or $10,000. We will still produce 100,000 bulbs at a cost of $5 per bulb. This will cost 100,000 $5 or $,500,000. The total cost is now Total , , 000 1,535, 000 set up production holding In this case, the holding cost dropped by $5,000, but the set up cost increased by $500. This results in a lower total cost. Continuing with this strategy, we can fill out the following table: Size of Batch Set Up Production Holding Total 100, ,000(5) 50,000(1) ,000550,0001,555,000 50,000 (5000) 100,000(5) 5,000(1) ,0005 5,0001,535,000 10,000 10(5000) 100,000(5) 5000(1) , ,555, (5000) 100,000(5) 500(1) , ,000,500 As the lot size decreases, the set up cost increases and the holding cost decreases. Initially, the holding cost is much higher. But for smaller 19
6 batch sizes, the set up cost is much higher. Somewhere in the middle is a batch size whose total cost is as small as possible. To find the batch size that minimizes the total cost, we need to find a function that models the total cost as a function of. Examine the patterns in the table. Each set up cost in the second column is a product of $5000 and the number of batches that will be produced. We get the number of batches by dividing 100,000 by the batch size, 100,000. This means a batch size of will have a set up cost of 100, 000 Set Up 500 In every row of the second column, the production cost is the same. So changing the size of the batch has no effect on the production cost. The holding cost is the product of the average inventory and the unit holding cost. If the batch size is, the holding cost is Holding 1 Let s add these expressions to the table. 0
7 Size of Batch Set Up Production Holding Total 100, ,000(5) 50,000(1) , ,0001,555,000 50,000 (5000) 100,000(5) 5,000(1) ,00055,0001,535,000 10,000 10(5000) 100,000(5) 5000(1) , ,555, (5000) 100,000(5) 500(1) , ,000, , , ,000(5) , Notice that the expression in the last row for the total cost preserves the pattern for all values of above it. The total cost as a function of the batch size is 100, 000 TC( ) , Before we take the derivative to find the critical points, let s simplify this function, 500,000,000 TC( ),500, ,000,000,500,000 Rewrite with negative exponents and change the division in the last term to multiplication Using the Power Rule, the derivative is computed as 1
8 TC ( ) 500, 000, , 000, Use the Power Rule as well as the Product with a Constant Rule Switch the negative exponent back to a positive exponent Notice that the production cost drops out of the critical point calculation meaning the production cost has nothing to do with the economic lot size. This function is undefined at 0. But a batch size of 0 is not a reasonable answer since a total of 100,000 bulbs must be made. More critical points can be found by setting the derivative equal to 0 and solving for : 500, 000, ,000,000, ,000,000,000 31, 63 Set derivative equal to zero Multiply both sides by Add 1,000,000,000 to both sides to clear fractions Square root both sides of equation Only the quantity 31,63 bulbs makes sense. But is this critical point a relative minimum or a relative maximum? To check, we ll substitute the critical point into the second derivative and determine the concavity at the critical point. Starting from the first derivative, TC( ) 500, 000, 000, the second derivative is 1 TC( ) 1,000,000, , 000, At the critical point,
9 1,000,000,000 TC(31,63) ,63 The second derivative is positive since the numerator and denominator are both positive. A function that has a positive second derivative at a critical point is concave up. This tells us that 31,63 minimum. The total cost at that point is 500, 000, , 63 TC(31, 63),500, , 63,531, 6.78 is a relative A lot size of approximately 31,63 bulbs leads to the lowest total cost possible of $,531,6.78. Some companies purchase their inventory from manufacturers. Instead of deciding how many units to manufacture in each batch, they must decide how many units they should order and when they should order the units. For a business like this, the set up cost is replaced by the ordering cost. The ordering cost includes all costs associated with ordering inventory such as developing and processing the order, inspecting incoming orders, and paying the bill for the order. Larger companies may also have purchasing departments. The ordering cost also includes the cost of the personnel and supplies for the purchasing department. Ordering more often lowers holding cost since it results in lower inventory levels. This also raises ordering cost since more orders must be placed. The total cost is minimized at an order size that balances the ordering cost and the holding cost. This order size is called the economic order quantity. 3
10 Example 4 Find the Economic Order uantity The annual demand for a particular wine at a wine shop is 900 bottles of wine. It costs $1 to store one bottle of wine for one year. It costs $5 to place an order for a bottle of wine. A bottle of wine costs an average of $15. How many bottles of wine should be ordered in each order to satisfy demand and to minimize cost? Solution Upon examining this problem, it might appear that the wine shop should simply order 900 bottles of the wine once a year. While this is a possible solution and lowers the ordering cost, it would incur a large holding cost. The wine shop could also place 18 orders of 50 bottles each. This would lower the holding cost, but increase the ordering cost. Another possibility would be to order each bottle individually. This would lower the holding cost even more, but increase the ordering cost. The appropriate order size will balance the holding cost and the ordering cost so that the total cost is as small as possible. To solve this problem, we need to find a total cost function. Once we have this cost function, we ll take the derivative of the function to find the critical points and locate the relative minimum. For this problem, we need to vary the order size to see the effect on the costs. For this reason, the variable in this problem will be the order size. Let s calculate the costs for several different values of to see the relationship between the order size and the total cost. Suppose we make a single order of 900 bottles of wine. Since we are making a single order, the ordering costs will be $5. However, it will take the entire year for all of these bottles to be sold. The average amount on hand will be average inventory 450 4
11 Thus the storage costs will be 450 bottles $1 per bottle to store. Each bottle of wine costs an average of $15, so 900 bottles will cost 900 $15 or $13,500. The total cost is Total If we make two orders of 450 bottles each, the reordering cost will be $5 and the storage costs will be 5 bottles $1 per bottle. Assuming the cost of the wine does not change throughout the year, the wine will still cost $13,500. For this order size, the total ordering cost is Total Using this strategy, we can fill out the table below: Order Size Ordering Storage of Wine Total (1) 13, (5) 5(1) 13, (5) 11.5(1) 13, (5) 5(1) 13, (5) 5(1) (5) 0.5(1) (5) 0.5(1)
12 Look at each line of this table. As the order size decreases, the reordering costs increase and the storage costs decrease. The sum of all costs starts at $13955 and decreases initially as the storage costs drop. However the reordering costs begin to build up eventually causing the total ordering cost to increase to $ for an order size of 1 bottle. Based on the table, we can guess that an order around 50 bottles might lead to the lowest total ordering cost. To make this more exact, we need to find the total cost as a function of the order quantity. The ordering cost come from the number of orders times the cost per order. We can find the number of orders by dividing 900 by the order size or 900. The ordering cost is 900 Ordering 5 The holding cost are simply the average inventory times the cost per bottle to store or Holding 1 The total cost function is the sum of these costs and the cost of the wine, 900 TC( ) Let s add these quantities to our table to see how they match up with the numbers we found before: 6
13 Order Size Reordering s Storage s of Wine Total (1) 13, (5) 5(1) 13, (5) 11.5(1) 13, (5) 5(1) 13, (5) 5(1) (5) 0.5(1) (5) 0.5(1) Each ordering cost in the second column consists of the $5 cost to order times a value. This value is the number of orders you will need to make during the year. Each holding cost in the third column consists of the $1 cost to store one bottle for one year, times the average inventory. The expression we have written for the total costs preserves these patterns. Before we find the critical points of TC( ), let s simplify the function to make the derivative easier to find. Carry out the multiplication in the first term and use negative exponents in the first term to give TC( ) The derivative of this function is 7
14 TC( ) Use the Power Rule for Derivatives Change the negative exponent to a positive exponent To find the critical points, we need to find where the derivative is undefined or equal to 0. This function is undefined at 0, but an order size of 0 is not a reasonable order since we need 900 bottles annually. Setting the derivative equal to 0 and solving for yields Multiplying both side by clear fractions Add 9000 to both sides to Square root both sides This is approximately Clearly, a negative order size makes no sense. The only reasonable critical point for this function is To insure that this is a relative minimum and not a relative maximum, we ll apply the second derivative test. The second derivative is TC( ) Change the negative exponent to a positive exponent At the critical point, the second derivative is 9000 TC(94.87) so the original function TC( ) is concave up. The critical point at is a relative minimum. 8
15 Should the wine shop order bottles of wine? Bottles of wine are sold in integer amounts so we have two options: order 94 bottles (and not meet the demand) or order 95 bottles (and have a few bottles extra at the end of the year). You might choose to order 95 per order to simply insure that you satisfy all customers, but which option is cheapest? TC(94) $ TC(95) $ In deciding which option is better, you ll need to balance what is the biggest benefit and what are the costs of the decision. In this case, an order size of 95 is slightly cheaper than an order size of 94 and ensures that all customers are satisfied. 9
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