What is EOQ vs EPQ + ABC Analysis, Vendor Managed Inventory, and JIT

The video introduces several strategies companies use to control inventory: Economic Order Quantity (EOQ), Economic Production Quantity (EPQ), Reorder Point, ABC Analysis, Vendor Managed Inventory (VMI), and Just-In-Time (JIT).

EOQ and EPQ are models to optimize inventory levels by balancing ordering costs and carrying costs. EOQ is for finished goods that don't require production, while EPQ is for items used in production. Both aim to prevent excessive cash tied up in inventory.

The EOQ model has several assumptions: only one product, known annual demand, consistent demand rate throughout the year, stable lead time, single delivery per order, and no quantity discounts. These conditions are crucial for the model's accuracy.

EPQ shares similar assumptions with EOQ, including one item involved, known annual demand, and consistent usage/production rates. It also assumes a constant production rate, stable lead time, and no quantity discounts, which would distort cost calculations.

The Reorder Point is a simple model that triggers an order when inventory levels hit a predetermined point, based on average usage and lead time. This helps maintain stock without over-ordering, especially for perishable items or those with varying consumption.

ABC Analysis categorizes inventory items based on their importance (A, B, or C). 'A' items are the most critical, highly controlled, and contribute significantly to revenue, often following the 80/20 rule. 'B' items are moderately controlled, and 'C' items have less control and importance, reflecting a large SKU assortment.

VMI involves a supplier or vendor managing the inventory on behalf of the customer, common in business-to-business relationships like Walmart and Coca-Cola. The customer shares sales data, and the vendor handles replenishment, reducing the customer's overhead costs.

Just-In-Time (JIT) focuses on receiving inventory precisely when needed for production or shipping, minimizing holding costs. Just-In-Time Two (JIT2) extends this concept by strengthening the supplier-customer relationship, often involving a supplier employee working on-site at the customer's facility to manage inventory at the distribution level.

The video concludes by summarizing that EOQ/EPQ balance ordering and holding costs (EOQ for finished goods, EPQ for production items). Reorder Point manages stock based on usage and lead time. ABC Analysis categorizes inventory by importance. VMI involves suppliers managing customer inventory based on sales data, and JIT/JIT2 optimize inventory arrival and strengthen supplier-customer relationships.