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M10.L05 — Network Externalities and Technology Markets

Module: Module 10 — Externalities and Market Failure Lesson: L05 of 05 Duration: ~30 minutes Level: Introductory Provenance: Microeconomics 1e (Medeiros) | Khan Academy Microeconomics

Learning Objective

Analyze how network effects shape technology markets and competition.

Network Externalities

Network externalities occur when a product’s value increases with the number of users, leading to winner-take-all markets. Examples include EFTPOS (Australia’s payment network) and Afterpay (BNPL), where widespread adoption creates lock-in effects and high switching costs.

Tipping points can occur—once a platform reaches critical mass, competitors struggle to survive.

Worked Example

Afterpay’s Dominance in Australia

  1. Early Adoption: First-mover advantage attracted merchants and consumers.
  2. Network Effect: More users made Afterpay more valuable for new participants.
  3. Lock-in: Switching to competitors became costly due to established merchant partnerships.

Common Misconception

"Better technology always wins in competitive markets."

Network effects can lead to inferior technologies dominating (e.g., QWERTY keyboards). Market power often hinges on adoption speed, not just quality.

Key Takeaways

  • Network effects create winner-take-all dynamics.
  • Positive feedback loops accelerate market dominance.
  • Lock-in and switching costs protect incumbents.
  • Competition policy must balance innovation with market power concerns.

Practice

  1. Why did EFTPOS become Australia’s dominant payment network?
  2. How do social media platforms exhibit network effects?
  3. What policy tools can address excessive market power from network effects?

Further Resources

Provenance: Microeconomics 1e (Medeiros) | Khan Academy Microeconomics