Lukasz Grzybowski

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This article estimates the price elasticities of the demand for mobile telephone calls and the demand for messages for Portugal. We use a panel of individual level data. In order to account for the unobserved individual heterogeneity and for the data censoring, we estimate a Tobit model for panel data with individual random effects. The demand for calls and(More)
In this paper we analyze the demand for mobile telecommunication services in Germany in the period from January 1998 to June 2003. During this time, the subscriber base grew exponentially by about 700% while prices declined only moderately by about 41%. We believe that prices alone cannot account for such rapid diffusion and network effects have influenced(More)
This paper analyzes competition in a two-period differentiated-products duopoly in the presence of both switching costs and network effects. Consumers are assumed to have rational expectation about network sizes, and future prices. The equilibrium prices in both periods are lower than markets with just switching costs and they decrease with the magnitude of(More)
We analyze the demand for mobile telecommunications services in Germany in the period from January 1998 to June 2003. In this time we observe explosive growth in the subscriber base and rather moderate decrease in prices. Our conjecture is, that prices alone cannot account for such rapid diffusion, therefore we explore the possible contribution of network(More)
In this paper I estimate the magnitude of switching costs in the UK mobile industry. Using a survey data with individual choices of network operators in two consecutive years I find a presence of very strong average switching costs, which make the majority of consumers reluctant to switch networks. The size of average switching costs differs significantly(More)
In this paper I analyze the development and competitiveness of mobile telecommunications industry across the European Union. I estimate a reduced form and structural model of mobile industry using panel data for the EU countries in years 1998-2002. The competitiveness level is significantly influenced by the regulation policy. The regulation implemented(More)
This article assesses the unilateral effects on prices of a merger in the Portuguese mobile telephony market. We use aggregate quarterly data from 1999 to 2005 and a nested logit model to estimate the price elasticities of demand and the marginal costs of subscription of mobile telephony. Given these estimates, we simulate the effects of the merger. We find(More)