Why define markets in competition cases?
Stellenbosch Working Paper Series No. WP10/2013Publication date: 2013
Author(s):
Competition policy investigations usually commence with a definition of the relevant product and geographic market. The relevant market provides a first evaluation of competitive conditions and allows for the calculation of market shares, which aids in the assessment of firms’ market power. Given its implications for assessing market power, the market definition in a competition case is frequently contested. Critics argue that market definition is often arbitrary and should be avoided. Instead, IO scholars argue that modern econometric methods are capable of directly estimating market power and competitive effects without the need for defining markets. We argue that market definition not only offers a valuable first screen for market power, but actually involves a substitution analysis that lies at the heart of any competition case. We argue that it is suboptimal to promote a single encompassing econometric model instead of the multi-faceted empirical approach underlying most market definition exercises in practice. In addition, we note that market definition involves much more than merely the estimation of price elasticities, which are in any event difficult to estimate in most competition cases.
JEL Classification:L11, L40, L41, K21
Keywords:market, market definition, market share, substitutability, price elasticity, antitrust, competition policy, mergers, monopolization
Download: PDF (150 KB)Login
(for staff & registered students)
Upcoming Seminars
Monday 26 May 202512:00-13:00
Prof Simon Franklin: Queen Mary University In London
Topic: "No Place Like Home? The Causal Effect of Housing Clearances in Central Addis Ababa"
12:00-13:00
Dr Dawie van Lill: South African Reserve Bank & Stellenbosch University
Topic: "TBC"
12:00-13:00
Prof Hylton Hollander: University Of Cape Town
Topic: "TBC"
BER Weekly
16 May 2025 Trade truce lifts markets, SA braces for winter load-shedding and budget reckoningThis week, data showed that South Africa’s unemployment rate rose in 2025Q1, with net job losses compared to 2024Q4. Meanwhile, mining output improved in March but declined overall for the quarter. In the US, inflation eased to a four-year low, while Germany’s economic sentiment rebounded sharply. The UK economy posted impressive growth in Q1; however,...
Read the full issue
Upcoming Seminars
Monday 26 May 202512:00-13:00
Prof Simon Franklin: Queen Mary University In London
Topic: "No Place Like Home? The Causal Effect of Housing Clearances in Central Addis Ababa"
12:00-13:00
Dr Dawie van Lill: South African Reserve Bank & Stellenbosch University
Topic: "TBC"
12:00-13:00
Prof Hylton Hollander: University Of Cape Town
Topic: "TBC"
BER Weekly
16 May 2025 Trade truce lifts markets, SA braces for winter load-shedding and budget reckoningThis week, data showed that South Africa’s unemployment rate rose in 2025Q1, with net job losses compared to 2024Q4. Meanwhile, mining output improved in March but declined overall for the quarter. In the US, inflation eased to a four-year low, while Germany’s economic sentiment rebounded sharply. The UK economy posted impressive growth in Q1; however,...
Read the full issue