We develop a model of international roaming in which mobile network operators (MNOs) compete both on the wholesale market to sell roaming services to foreign operators and on the retail market for subscribers. The operators own a network infrastructure only in their home country. To allow their...

Can digital information and communication technology (ICT) foster mass political mobilization? We use a novel geo-referenced dataset for the entire African continent between 1998 and 2012 on the coverage of mobile phone signal together with geo-referenced data from multiple sources on the...

Radio spectrum represents a scarce resource assigned to operators by national regulatory authorities through auctions, beauty contests or other mechanisms, aimed at introducing sufficient incentives for an optimal use of such a resource. A prerequisite for designing efficient assignment methods...

The public mechanical clock and the movable type printing press were two of the most important and complex general purpose technologies of the late medieval period. We document two of their most important, yet unforeseeable, consequences. First, an instrumental variables analysis indicates that...

India’s emergence in the world economy over the last decade, has often, in popular discourse, been attributed, at least to a large extent, to its sustained efforts towards technological learning and capacity building. In this paper we present an overview of India’s technological trajectory...

This paper introduces endogenous and directed technical change in a growth model with environmental constraints. A unique final good is produced by combining inputs from two sectors. One of these sectors uses "dirty" machines and thus creates environmental degradation. Research can be directed...

WITCH is an energy-economy-climate model developed by the climate change group at FEEM. The model has been extensively used in the past 3 years for the economic analysis of climate change policies. WITCH is a hybrid top-down economic model with a representation of the energy sector of medium...

The paper investigates socially optimal patterns of economic growth and environmental quality in a neoclassical growth model with endogenous technological progress. In the model, the environmental quality affects positively not only to utility but also to production. However, cleaner...

This paper applies the Directed Technical Change (DTC) framework to study improvements in the efficiency of energy use. We present a theoretical model which (1) shows that the demand for energy is shifted down by innovations in energy intensive sectors and (2) highlights the drivers of...

This paper analyses the theoretical issues related to the measurement of labour content in the context of general technologies with heterogeneous labour. A novel axiomatic framework is used in order to formulate the key properties of the notion of labour content and analyse its theoretical...