需要

1. Origins, structure, and basic meaning

• Structure: 需要 (じゅよう) is an economic noun for the amount of need or desire for a product or service.
• Basic usage: 飲み物の需要が増える makes demand rise with hot weather, while 地域の需要に合う数 uses local demand as the standard for how many products to prepare.

2. Common pitfalls and similar expressions

• Changing demand and supply quantity
  • 需要が増える describes a change in how much is wanted, while 需要に合う数 adjusts supplied products to that amount. Demand itself is not identical to the number of products prepared.