Business Sector

From Open Risk Manual

Definition

A business sector is the subset of a given economy that is made up of companies (in different legal forms) that are active with the same or related economic activities (same type of production or services).

Classification Schemes

  • Standard Industrial Classification (SIC)
  • North American Industry Classification System (NAICS)
  • Nomenclature statistique des activites economiques (NACE Classification)

Relevance for Portfolio Management

Management of diverse financial assets portfolios (bonds, loans, stocks) relies on identifying common perfomance characteristics that may drive significant segments of the portfolio (factors). It is very common to assume that business sectors are informative in this respect, although there is far from any consensus as to that intuitive dependency may be further quantified.

Depending on the precise application requirements there is a broad range for possible Factor Models that provide quantitative tools to express the degree of dependency between entities active in different business sectors

Issues and Challenges

  • Busines sectors can be difficult to define precisely as

modern economic activity tends to be a continuoum with many overlaps

References

NACE

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