This paper provides a guide to understanding physician claims data. Physician claims data reflect the prices and quantity of procedures provided by physicians and billed to insurers. These data are often used by policy analysts, legal professionals, and academics to analyze price dynamics in...

As a threshold matter, high market shares are considered informative of potential underlying competitive dynamics, especially issues of market power and dominance. However, as is well known, high shares may not tell the entire story. Beyond issues related to market definition, entry, and...

As a threshold matter, high market shares are considered informative of potential underlying competitive dynamics, especially issues of market power and dominance. However, as is well known, high shares may not tell the entire story. Beyond issues related to market definition, entry, and...