Sebastian Tapia

Sebastian Tapia

Economist | Antitrust & Litigation Analysis

Economist specializing in antitrust litigation and damages analysis.
I work with legal teams to build and defend data-driven arguments in complex disputes, translating large-scale data into clear economic evidence for case strategy.

What I Do

Antitrust & Competition Analysis: Evaluate market behavior, pricing dynamics, and competitive effects in complex disputes.
Damages & Counterfactual Modeling: Estimate economic harm using but-for frameworks grounded in data and economic theory.
Large-Scale Data Analysis: Clean, structure, and analyze complex datasets to support rigorous and defensible conclusions.
Economic Storytelling: Translate technical results into clear, structured arguments for attorneys, experts, and decision-makers.

Experience

Economist | Litigation Consulting | Christensen Associates & THM Group

Led data preparation and economic analysis across multiple antitrust and litigation matters, including a multi-state class action involving large-scale transactional datasets.
Served as the internal expert on a defendant’s dataset, overseeing data integrity, structure, and usability throughout the litigation process.
Developed econometric and analytical frameworks to evaluate pricing behavior, market dynamics, and competitive effects.
Contributed to damages estimation through counterfactual (but-for) analysis using historical pricing and project-level data.
Supported expert reports and collaborated with attorneys to align economic analysis with case strategy

Selected Litigation Experience

Worked on a multi-state antitrust class action involving alleged exclusionary conduct.
Analyzed large-scale sales, cost, and pricing datasets to assess competitive dynamics and market outcomes.
Evaluated price variation and product mix across geographic and product-level dimensions.
Supported development of economic evidence used in expert reports and litigation strategy.

Selected Project: ReSimple (Chile)

Designed and implemented a tender-based procurement system for recyclable materials under Chilean environmental regulation.
Worked with government officials, legal stakeholders, and industry participants to align economic design with regulatory and operational constraints.
Developed a system to improve efficiency, transparency, and compliance in the allocation of recycling responsibilities.
Contributed to a platform that is actively used in practice, impacting real-world market outcomes.