Marketers searching for extensive information or those who need to locate market information frequently may consider establishing an account with one of the major comprehensive information sources. These are the heavyweight sources of business research, used by university libraries and major corporations.
Comprehensive sources offer one-stop shopping for research reports, industry news, and even government information. In fact, much of the information available from sources already mentioned in this tutorial is also available through comprehensive information sources. However, gaining access to these services can be quite expensive and for some prohibitively expensive. Fortunately, several comprehensive information sources are now offering pay-per-item access.