Which term describes the products that require the vendor to keep items in stock throughout the season?

The correct term that describes products requiring the vendor to keep items in stock throughout the season is core products. Core products are typically those foundational items that a business offers year-round. They represent steady demand and are essential to the brand's identity, ensuring that customers can consistently find these items available. This ongoing availability helps establish customer loyalty, as consumers come to expect these core offerings to be stocked regularly.

In contrast, seasonal products are those that only have demand during specific times of the year, such as holiday-themed items. Fringe products tend to be novelty items or those that might not sell as consistently and could be stocked only on an as-needed basis. Promotional products focus on items that are offered for a limited time to drive sales and may not be part of the standard inventory.