Which of the following is NOT one of Porter's five forces?

• A. Competitive rivalry, supplier power, buyer power, threat of new entrants, threat of substitutes
• B. Government regulation
• C. They determine industry attractiveness
• D. They guide positioning and investment

Answer: (B)

Porter’s five forces framework analyzes how competitive pressure shapes industry profitability by looking at five specific forces: competitive rivalry among existing firms, bargaining power of suppliers, bargaining power of buyers, the threat of new entrants, and the threat of substitutes. Government regulation is not one of these forces, though policy changes can affect how strong the other forces are. For example, regulation can raise barriers to entry or alter supplier power, but it isn’t itself counted as a force in the model. The framework is used to assess industry attractiveness—how profitable an industry can be over time—and to guide where a firm should compete and how it should invest. Since government regulation isn’t part of the five forces, it’s the option that does not belong in the list.