Publication records

I develop a structural demand model for mobile telephone service, which facilitates the identification of network effects and compatibility between networks. Network effects are measured by the dependence of consumer willingness to pay on the installed base of subscribers. Compatibility is measured by the relative extent of cross- and own-network effects. I then estimate the model using quarterly panel data from the Polish mobile telephone industry from 1996-2001 and find strong network effects and - despite full interconnection of the mobile telephone networks - low compatibility. I also show that ignoring network effects leads to an overestimation of elasticity of demand.

 

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We study the dynamics of usage intensity of second-generation cellular telephony over the diffusion curve. Specifically, we address two questions: First, can we draw conclusions about the underlying drivers of technology diffusion by studying usage intensity? Second, what is the effect of high penetration of previous generations and competing networks on network usage intensity? Using an operator-level panel covering 41 countries with quarterly data over 6 years, we find that heterogeneity among adopters dominates network effects and that different technological generations are complements in terms of usage, but substitutes in terms of subscription.

A pdf file of this working paper may be available at INSEAD.

We explore the interaction between fairness attitudes and reference dependence both theoretically and experimentally. Our theory of fairness behavior under reference-dependent preferences in the context of ultimatum games, defines fairness in the utility domain and not in the domain of dollar payments. We test our model predictions using a within-subject design with ultimatum and dictator games involving gains and losses of varying amounts. Proposers indicated their offer in gain- and (neatly comparable) loss- games; responders indicated minimum acceptable gain and maximum acceptable loss. We find a significant “generosity effect” in the loss domain: on average, proposers bear the largest share of losses as if anticipating responders’ call for a smaller share. In contrast, reference dependence hardly affects the outcome of dictator games -where responders have no veto right- though we detect a small but significant “compassion effect”, whereby dictators are on average somewhat more generous sharing losses than sharing gains.