A business whose main focus of activity is on the product itself. They produce a product then try to convince people to buy it. These products might be basic necessities that do not have a brand name.
Factors affecting accuracy of market research data
How carefully the sample was drawn up, its size, the types of people selected etc.
How questions were phrased in questionnaires and surveys
Who carried out the research: secondary research is likely to be less reliable since it was drawn up by others for different purpose at an earlier time
Bias: newspaper articles are often biased and may leave out crucial information deliberately
Age of information: researched data shouldn't be too outdated. Customer tastes, fashions, economic conditions, technology all move fast, and the old data will be of no use now