Final answer:
Demand research primarily addresses the product needs and desires of buyers by evaluating their tastes, income level, and demographic factors.
Step-by-step explanation:
Research on demand primarily addresses the aspect of buyer behavior related to Product Needs and Desires. Demand is the amount of a product a consumer is willing and able to purchase at a given price, foundational to which are the consumer's tastes, preferences, and income - indicating their ability to purchase the product. Key factors influencing demand include tastes and preferences, income, prices of related goods, and demographic factors such as the size or composition of the population.