Antitrust Lab
Interactive tools for competition economics
Change the inputs, watch the outcome, and test the economics behind competition law. Each tool runs in your browser and needs no installation or login. The first visit takes a little longer while the tool loads.
Markets and market power
Monopoly and welfare
What does monopoly cost society? Consumer and producer surplus, deadweight loss, and rent seeking.
Open the tool →How many firms?
Are more firms always better? Competition, fixed costs, and free entry.
Open the tool →Market definition
Is this product a market of its own? SSNIP test, critical loss, and the cellophane fallacy.
Open the tool →Concentration and market power
How much market power do concentrated markets have? Lerner index, HHI and the merger screen, GUPPI.
Open the tool →Cartels, collusion, and mergers
Cartel damages
How much did the cartel overcharge? Difference-in-differences and structural estimates.
Tacit collusion
When can firms keep prices high without an agreement?
Merger simulator
Will this merger raise prices? Unilateral effects, efficiencies, remedies.
Vertical relations
Vertical relations
What changes when a supplier and its retailer deal with each other, or merge? Double marginalization, contracts, and foreclosure.
Digital markets
Platforms and tipping
Why do some markets tip to a single platform? Network effects, multihoming, and prices of zero.
Algorithmic pricing
Can pricing algorithms learn to collude without an agreement?