Market Power Measurement

Quality / Updated / COI

Quality

Reviewed

Updated

02/07/2026

Source

Citations & Trust

COI

none

TL;DR

Market Power Measurement helps teams decide reviewing competition policy by clarifying price markups, concentration levels, and entry barriers and the balance between competition promotion and firm profitability. It keeps scope, horizon, and assumptions aligned while making comparisons consistent.

Definition

Market Power Measurement describes how decision makers structure choices around price markups, concentration levels, and entry barriers. It sets the unit of analysis, the time horizon, and boundary conditions so comparisons stay consistent across options. The concept separates structural drivers from short term noise, which helps teams avoid false precision and overfitting. Applied well, it turns a vague debate into a measurable choice and records assumptions for review and future updates.

Decision impact

• Use Market Power Measurement to decide reviewing competition policy because it highlights price markups, concentration levels, and entry barriers and the balance between competition promotion and firm profitability.
• It changes prioritization by forcing teams to state the horizon, boundary conditions, and controllable drivers.
• It supports recalibration when leading signals move, so decisions remain anchored to current conditions.

Key takeaways

• Define the unit and horizon before comparing options across scenarios.
• Separate primary drivers from secondary noise and one time shocks.
• Document data sources, estimation steps, and confidence ranges for review.
• Translate the balance into thresholds that can be monitored over time.
• Revisit assumptions when boundary conditions or policies change.

Misconceptions

• Market Power Measurement is not a universal rule; results depend on boundary assumptions and data quality.
• A single signal is not sufficient without considering price markups, concentration levels, and entry barriers.
• Short term movements can mislead when responses arrive with delays.

Worked example

Example: A team reviewing competition policy over a twelve month horizon. They estimate price markups, concentration levels, and entry barriers from recent data, then test how the balance between competition promotion and firm profitability shifts under alternative scenarios. The analysis shows that misaligned signals widen gaps between targets and outcomes. The team adjusts the plan, sets monitoring checkpoints, and records assumptions so the decision can be revisited when inputs move. After two review cycles, they update the model and confirm the decision still holds.

Citations & Trust

• CORE Econ (The Economy)