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Oligopoly and Other Imperfect Markets

Substitution between fixed and mobile data amidst high levels of poverty and inequality

Ryan Hawthrone and Lukasz Grzybowski
Mobile broadband is the main means of connecting to the internet in developing countries, where fixed-line coverage is typically limited or non-existent. As a result, governments in developing countries are seeking means by which mobile broadband penetration might be increased. Footwear
Sep 2019
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Narrowing the ‘digital divide’: the role of complementarities between fixed and mobile data in South Africa

Ryan Hawthrone and Lukasz Grzybowksi
We study substitution between fixed and mobile broadband services in South Africa using survey data on 134,000 individuals between 2009 and 2014. In our discrete-choice model, individuals choose fixed or mobile and data services in a framework that allows them to be substitutes or complements. We...
Sep 2019
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Benefits of regulation vs competition where inequality is high: The case of mobile telephony in South Africa

Ryan Hawthrone and Lukasz Grzybowksi
We test for the distributional effects of regulation and entry in the mobile telecommunications sector in a highly unequal country, South Africa. Using six waves of a consumer survey of over 134,000 individuals between 2009-2014, we estimate a discrete-choice model allowing for individual-specific...
Aug 2019
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The Competitive Status of the South African Wheat Industry

Van der Merwe, J.D.; Cloete; P.C.; Van Schalkwyk, H.D. & Kleynhans, E.P.J.
This article investigates the competitiveness of the South African wheat industry and compares it to its major trade partners. Since 1997, the wheat-to-bread value chain has been characterised by concentration of ownership and regulation. This led to concerns that the local wheat market is losing...
Apr 2017
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The role of network effects and consumer heterogeneity in adoption of mobile phones: evidence from South Africa

Lukasz Grzybowski
In this paper we analyze the role of network effects and consumer heterogeneity in the adoption of mobile phones. We estimate the decision to adopt a mobile phone using panel survey data of South African households between the years 2008 and 2012, which includes interviews with all adult household...
Jun 2015
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Economies of Scale and Pension Fund Plans: Evidence from South Africa

Albert Touna Mama, Neryvia Pillay and Johannes W. Fedderke
The focus of this paper is on the presence of economies of scale in administering pension funds. We make use of a unique dataset with extensive information on South African retirement funds from 1996 to 2006. For almost fifty years now, South Africa has operated under a system with small social...
Apr 2011
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Loss leader or low margin leader? Advertising and the degree of product differentiation

Witness Simbanegavi
This paper attempts to isolate the conditions that give rise to loss leader pricing. I show that for sufficiently low distance between firms, the advertised good is priced below cost irrespective of whether firms advertise the same or different products. Instead, if products are sufficiently...
Jan 2008
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