Question 1

Periodic review policies require more safety inventory than continuous review policies for the same level of product availability.

Accepted Answer

Periodic review policies involve ordering inventory at fixed intervals, which can result in higher safety stock levels to ensure product availability during the time between orders. Continuous review policies, on the other hand, involve ordering inventory when stock levels reach a predetermined threshold, thereby potentially reducing the need for as much safety stock.

Question 2

Inventory carried for the purpose of satisfying demand that exceeds the amount forecasted for a given period is

Accepted Answer

Safety inventory is the inventory that is held as a buffer to protect against variations in demand or supply. It is carried for the purpose of satisfying demand that exceeds the amount forecasted for a given period.

Question 3

Manufacturer-driven substitution increases overall profitability for the manufacturer by allowing some aggregation of demand,which reduces the inventory requirements for the same level of availability.

Accepted Answer

Manufacturer-driven substitution allows the manufacturer to substitute one product for another in response to changes in demand, allowing for better inventory management and ultimately increasing profitability.

Question 4

In most supply chains,the key to reducing the underlying forecast uncertainty is to link all forecasts throughout the supply chain to customer demand data.

Accepted Answer

Linking all forecasts throughout the supply chain to customer demand data helps to reduce forecast uncertainty as it provides greater accuracy in predicting demand at all levels of the supply chain. This can result in better inventory management, reduced costs, and improved customer satisfaction.

Question 5

The issue of product availability and the level of safety inventory is particularly significant in industries where

Accepted Answer

When product life cycles are short and demand is very volatile, it becomes difficult to predict the demand for products accurately, and as a result, it is challenging to maintain the right level of safety inventory. In such cases, an adequate level of safety inventory is required to ensure that products are available when customers need them. Additionally, manufacturers may need to use agile production methods to respond quickly to changes in demand.

Question 6

The required safety inventory grows rapidly with a decrease in the desired product availability.

Accepted Answer

A decrease in desired product availability means that less inventory is needed to cover demand variability, so the required safety inventory would decrease, not grow.

Question 7

Postponement allows the supply chain to delay product differentiation,which results in disaggregating most of the inventories in the supply chain.

Accepted Answer

The answer of Postponement allows the supply chain to delay...

Question 8

If aggregation reduces the required safety inventory for a product by a small amount,it may be best to carry the product in multiple decentralized locations to reduce response time and transportation cost.

Accepted Answer

Carrying the product in multiple decentralized locations can reduce response time and transportation costs, even if aggregation only slightly reduces safety inventory.

Question 9

Cycle inventory is inventory carried to satisfy demand that exceeds the amount forecasted for a given period.

Accepted Answer

Cycle inventory is the portion of inventory that a company maintains to meet normal demand during the course of an inventory cycle, not the excess demand beyond forecasted amounts.

Question 10

Aggregation reduces the standard deviation of demand only if demand across the regions being aggregated is not perfectly positively correlated.

Accepted Answer

If demand across the regions being aggregated is perfectly positively correlated, aggregation will not reduce the standard deviation of demand. However, if the correlation is less than perfect, aggregation can reduce the standard deviation of demand as the variability of individual regions' demand may offset each other when aggregated.

Question 11

In case demand in different geographical regions is about the same size and independent,aggregation increases safety inventory by the square root of the number of areas aggregated.

Accepted Answer

Aggregation in this context typically reduces the overall safety inventory required, as it leverages the risk pooling effect, which suggests that variability in demand across different areas tends to cancel out, thus reducing the total safety inventory needed rather than increasing it.

Question 12

The trade-off that a supply chain manager must consider when planning safety inventory is

Accepted Answer

Planning safety inventory involves balancing the costs of holding excess inventory versus the benefits of increased product availability. By increasing safety inventory levels, a supply chain manager can ensure that customers will have access to products even during periods of high demand or supply chain disruptions. However, this comes at the cost of increased inventory holding costs, which can impact profitability. Therefore, supply chain managers must carefully consider the tradeoff between product availability and inventory costs when planning safety inventory levels. A is the correct choice as it reflects this tradeoff.

Question 13

The required safety inventory increases with an increase in the lead time and the standard deviation of periodic demand.

Accepted Answer

This is a well-known fact in inventory management. A longer lead time and a higher standard deviation of demand will increase the likelihood of stockouts, which requires having a larger safety stock to ensure adequate inventory availability.

Question 14

The lower the coefficient of variation of an item,the greater the reduction in safety inventories as a result of centralization.

Accepted Answer

The answer of The lower the coefficient of variation of...

Question 15

A reduction in supply can help dramatically reduce safety inventory required without hurting product availability.

Accepted Answer

A reduction in supply typically increases the need for safety inventory to buffer against the risk of stockouts and maintain product availability, especially in the face of demand variability.

Question 16

Safety inventory is carried because

Accepted Answer

Safety inventory is carried to account for uncertainty in demand forecasts. It serves as a buffer to ensure that there is enough inventory on hand to meet unexpected increases in demand or disruptions in supply chain operations. Therefore, options A, C, and D are incorrect as they do not accurately explain the purpose of safety inventory.

Question 17

A key to the success of any supply chain is to figure out ways to decrease the level of safety inventory carried without hurting the level of product availability.

Accepted Answer

Decreasing safety inventory is a common goal in supply chain management, as it can help reduce costs and improve efficiency. However, it is important to do so without compromising the level of product availability or customer service. This requires careful planning, forecasting, and coordination among supply chain partners.

Question 18

When using a continuous review policy,a manager has to account for the uncertainty of demand during the lead time and the review interval.

Accepted Answer

In a continuous review policy, inventory levels are monitored continuously, and orders are placed whenever inventory levels hit a predetermined reorder point. The uncertainty of demand is accounted for during the lead time, but there is no review interval in continuous review systems since monitoring and ordering are ongoing processes.

Question 19

Given the product variety and high demand uncertainty in most high-tech supply chains,a significant fraction of the inventory carried is safety inventory.

Accepted Answer

Safety inventory is held to account for uncertainty in demand or supply. High-tech supply chains tend to have a high degree of product variety and demand uncertainty, which results in a higher amount of safety inventory being held.

Question 20

A goal of any supply chain manager is to reduce the level of safety inventory required regardless of the affect product availability.

Accepted Answer

The goal of a supply chain manager is to balance the level of safety inventory with product availability. While reducing safety inventory can help cut costs, it can also lead to stockouts and customer dissatisfaction. Therefore, the aim is to find the optimal level of safety inventory that minimizes risk and cost while ensuring adequate product availability.

Quiz 12: Managing Uncertainty in a Supply Chain: Safety Inventory