Final answer:
Primary research suppliers are firms that specialize in conducting direct interviews, observations, recordings, and behavioral analysis of individuals who purchase or influence the purchase of a specific good or service. They provide valuable insights into consumer preferences and behaviors, allowing businesses to make informed decisions.
Step-by-step explanation:
Firms that specialize in interviewing, observing, recording, and analyzing the behavior of those who purchase or influence the purchase of a particular good or service are called primary research suppliers. These firms conduct primary research by directly collecting data themselves through interviews and other methods. They gather information from the target audience to understand their preferences, motivations, and behaviors, which can help businesses make informed decisions about their products or services.