Some industries are structurally profitable and others are structurally difficult, almost regardless of how well individual companies are run. Michael Porter's five forces framework explains why: the profit an industry can earn depends on the power of its customers and suppliers, the threat of new entrants and substitutes, and the intensity of rivalry among existing competitors.

The framework is widely known and often applied as a qualitative discussion. It becomes far more useful when each force is scored with evidence and compared across industries or segments.

Evidence for each force

  • Rivalry: market concentration, growth of the market, price changes and the share of capacity that sits idle.
  • New entrants: capital needed to enter, regulation, scale economies and the number of recent entries.
  • Suppliers: how concentrated they are and the share of your costs that depends on a few of them.
  • Buyers: customer concentration, switching costs and how much your product weighs in their costs.
  • Substitutes: alternatives that solve the same need differently, and the price at which customers would switch.
The five forces scored from 1 (weak) to 5 (intense) for two industries: specialty software faces weak forces, commodity packaging faces intense ones. Illustrative scores.

The comparison makes the economics visible. Specialty software faces weak forces on almost every side: high switching costs keep buyers loyal and suppliers are fragmented. Commodity packaging faces strong buyers, concentrated suppliers of raw materials and intense rivalry for capacity. Even an excellent packaging company works against its industry; an average software company is helped by its own.

From diagnosis to strategy

  1. Find the force that hurts most and trace it to a specific mechanism, such as a customer that buys 30% of the volume.
  2. Position where the forces are weakest: segments with higher switching costs, specialised products or less concentrated buyers.
  3. Reshape the force itself: long-term contracts, a second supplier, services that raise switching costs, or consolidation that reduces rivalry.
  4. Use it to test acquisitions: buying into an industry with intense forces requires a clear reason why you will escape them.
BS

Bartor S.

Founder

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