The Text Lists a Number of Major Syndicated Data Services

The text lists a number of major syndicated data services including ACNielsen and J.D.Power and Associates.Obviously,these firms provide value to marketers or they would go out of business.What advantages do syndicated data services provide relative to marketers conducting primary research to address their research needs? What are the disadvantages associated with using syndicated data services?
The first advantage is syndicated data already exists and can be accessed quickly.Second,since syndicated services sell information to a number of client companies,the cost of syndicated data is likely to be less than the cost of primary research.The disadvantages are the data might not adequately address the researcher's needs,it might not be timely,and the methodology might not be relevant and might contain bias.