What is one of the four broad categories of inventory costs?

Sunk costs refer to expenses that have already been incurred and cannot be recovered. They are not considered a category of inventory costs since they do not affect current or future inventory management decisions. Instead, sunk costs are relevant in financial decision-making but do not pertain to the costs associated with inventory acquisition or maintenance.

Depreciation costs relate to the reduction in value of fixed assets over time due to wear and tear or obsolescence. While they are a significant accounting consideration, they do not fall under inventory costs, which specifically pertain to the costs of holding and managing stock. Depreciation is more relevant to long-term asset management than to the direct costs of inventory.

Selling costs encompass expenses related to marketing, sales personnel, and distribution of products, which are necessary for generating sales but are not classified as inventory costs. Although selling costs can impact overall profitability, they do not include the costs directly associated with inventory acquisition or management.