原価

1. Origins, structure, and basic meaning

• Structure: 原価(げんか) is a noun for the underlying cost of producing or obtaining a product.
• Basic usage: It is calculated in 商品の原価を計算する and narrowed to an ingredient or material in 材料の原価.

2. Common pitfalls and similar expressions

• Cost and selling amount
  • 原価 focuses on the cost of preparing the product or material rather than the amount charged when it is sold.
• Whole and component
  • It can describe the cost of an entire product or the cost of one component, as in 材料の原価.