industriiezweige
Industriiezweige, or branches of industry, are categories used to group firms according to the main economic activity they engage in. They provide a framework for collecting statistics, analyzing economic structure, and informing policy and business decisions.
In most economic classifications, industriiezweige are organized hierarchically into sectors such as primary, secondary and tertiary.
International and national statistics use standardized classification systems, most notably the International Standard Industrial Classification (ISIC)
The concept supports economic analysis by enabling comparisons, identifying dominant industries, and tracking trends in output,
However, industry boundaries are increasingly blurred by activities that span several branches, such as information technology,
Historically, industriiezweige reflected economies dominated by agriculture and manufacturing; in many countries services now play a