Research
Quantitative competition analysis: Stationarity tests in geographic market definition
Stellenbosch Working Paper Series No. WP17/2006Publication date: 2006
Author(s):
The paper focuses on the delineation of geographic markets in competition analysis, investigating the use of both quantitative and qualitative evaluation in the market definition exercise. To this end, the first part is devoted to a conceptual framework for market definition (adopted from Haldrup (2003)). Thereafter, a variety of price tests are explored that can be applied within the quantitative part of the framework. Similar to Forni (2004), the paper emphasizes the use of stationarity tests (that is, tests for the existence of unit roots) – illustrating their application to a recent competition investigation in South Africa.
JEL Classification:L40, L41, L43, D4
Keywords:Market definition, Delineation, Quantitative, Stationarity tests, Prices, Geographic, SSNIP, Hypothetical monopolist, Competition, Unit root, Price ratio, Antitrust
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Upcoming Seminars
Monday 21 July 202512:00-13:00
Izak Odendaal: Old Mutual Wealth Chief Investment Strategist
Topic: "Diverging fiscal policies and what it means for markets"
12:00-13:00
Dr Neil Rankin: Ceo Of Predictive Insights & Stellenbosch University
Topic: "TBC"
12:00-13:00
Prof Willem Boshoff: Stellenbosch University
Topic: "Two competing approaches in South African competition policy: merger control and anti-cartel enforcement over the past 30 years"
BER Weekly
27 Jun 2025 Another setback for the GNU, but oil markets breathe a little easierThis week was marked by heightened tensions both domestically and internationally. At home, friction intensified between the two largest parties in the Government of National Unity (GNU), the ANC and the DA, following the firing of one of the DA's deputy ministers. Internationally, the US conducted airstrikes on three Iranian nuclear facilities using...
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