A classification of a group of companies that are related in terms of their primary business activities. CLEAR classifies industries by their 2017 North American Industry Classification System (NAICS) codes, though industry definitions can vary by study. Other categories will be added as they are studied.
Firm Characteristics
Features of the firms or companies under study
NAICS code 23
NAICS code 51
NAICS codes 31–33
The number of employees in a firm
A business that is limited in size and revenue. The definition varies by industry.