Diamond Model (Porter, 1990): National Competitive Advantage

Diamond Model (Porter, 1990): National Competitive Advantage

Overview

Porter's Diamond Model explains why certain nations become home bases for globally competitive industries. Four interconnected determinants — factor conditions, demand conditions, related and supporting industries, and firm strategy/structure/rivalry — form a self-reinforcing system. Government and chance act as external variables that influence the diamond but are not determinants themselves. Crucially, national advantage is industry-specific, not economy-wide.

When to Use

Trigger conditions:

• User asks why a country dominates a specific industry (e.g., Swiss watches, Korean semiconductors)
• User needs to evaluate a country as a base for a specific industry
• User is comparing national environments for investment or relocation decisions
• User mentions "national competitiveness", "diamond model", "Porter's diamond", or "country advantage"

When NOT to use:

• For firm-level competitive strategy -> use Porter's Five Forces
• For firm-level FDI decisions -> use grad-oli
• For gradual market entry -> use grad-uppsala

Assumptions

IRON LAW: National Competitive Advantage Is INDUSTRY-SPECIFIC,
          NOT Country-Wide

A country does not have "competitive advantage" in general.
Germany has advantage in automotive and chemicals, NOT in software.
The US has advantage in tech and finance, NOT in consumer electronics
manufacturing.

NEVER assess a country's competitiveness without specifying the
industry. A "strong diamond" for one industry may be a weak diamond
for another in the SAME country.

• Competitive advantage is created, not inherited — advanced factors matter more than basic factors
• Domestic rivalry is a key driver of international competitiveness
• The four determinants reinforce each other as a system — isolated strengths are insufficient
• Government's role is to influence the determinants, not to pick winners