Cognitive Scaffold

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MENTAL MODEL · M3590

Porter's Five Forces

Porter's Five Forces
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Updated 2026-07-31

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INTRODUCTION

English translation pending.

CORE DEFINITION

Michael Porter's five forces assess the profit potential of an industry: rivalry among existing competitors, threat of new entrants, threat of substitutes, bargaining power of suppliers, and bargaining power of buyers. Their combined strength sets the ceiling on the profit pool available to participants. The framework answers whether an industry is worth entering, a different question from how large its market is.

SCAFFOLDING EFFECT

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- Attractiveness test: decide whether an industry is worth entering before sizing its market. - Profit-pool diagnosis: find which of the five forces is compressing margins, and why. - Positioning choice: decide where to sit so that the strongest force matters least to you.

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Industry profitability is set by the structure of competition rather than by growth. Strong rivalry, easy entry, ready substitutes, or powerful suppliers and buyers all transfer value away from incumbents. Because these forces act together, a large market can still be unprofitable, and a modest one can be attractive if the structure is favorable.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Porter's_five_forces_analysisZH · Explicit
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