This document discusses the economic order quantity (EOQ) model. It begins with an introduction and definitions of EOQ. It then outlines the assumptions of the EOQ model including constant demand, price, carrying costs, ordering costs, and instant delivery. The document explains that EOQ can be used to determine the optimal inventory order quantity each month by minimizing total costs. It presents the total cost formula considering purchase, order, and holding costs. The document provides an example calculation to demonstrate finding the EOQ. It closes with cautions on using EOQ as a tool rather than a simple solution and emphasizes understanding the equation and inputs.