While doing your research, you may come across descriptions of market research reports for very specialized industries. Since they often cost hundreds or thousands of dollars, the library cannot buy such reports. You may wish to let clients know about them, though, in case they might be willing to fund the purchase.
NAICS (pronounced nakes), or North American Industry Classification System:
The NAICS system was meant to replace an older system called SIC (Standard Industrial Classification), but plenty of databases and reference books still use SIC codes.
While doing your research, you may come across descriptions of market research reports for very specialized industries. Since they often cost hundreds or thousands of dollars, the library cannot buy such reports. You may wish to let clients know about them, though, in case they might be willing to fund the purchase.