I study the implications of exclusive contracts for smartphones. Theory models indicate that lower demand elasticities for handsets relative to wireless networks could lead to exclusive contracts maximizing joint profits of the contracting parties. I estimate smartphone and carrier demand on a detailed monthly market-level dataset of US consumer decisions over 2008-2010. Counterfactual simulati...

In many competitive settings consumers buy multiple product categories, and some prefer to use a single firm, generating complementary cross-category price effects. To study pricing in supermarkets, an organizational form where these effects are internalized, we develop a multi-category multi-seller demand model and estimate it using UK consumer data. This class of model is used widely in theor...

We introduce a simple model of oligopolistic competition where firms first build capacity, and then, after observing the capacity decisions, choose a reservation price at which they are willing to supply their capacities. This model describes many markets more realistically than the model of Kreps and Scheinkman [Kreps, D., Scheinkman, J., 1983. Quantity precommitment and Bertrand competition y...

Serial correlation in annual growth rates carries a lot of information on growth processes – it allows us to directly observe firm performance as well as to test theories. Using a 7-year balanced panel of 10 000 French manufacturing firms, we observe that small firms typically are subject to negative correlation of annual growth rates, whereas larger firms display positive correlation. Furtherm...

We analyze the relationship between website visits, magazine demand and the demand for advertising pages using Granger non-causality tests on the basis of an extensive and externally audited quarterly data set for the German magazine market spanning the period I/1998 to II/2004. We use traditional panel data estimators and an estimator suitable for heterogeneity across magazines. We find very r...

In Lentz and Mortensen (2005), we formulate and estimate a market equilibrium model of endogenous growth through product innovation in the spirit of Klette and Kortum (2004). In this paper, we provide a quantitative solution to the social planner’s problem in the modeled environment. We find that the optimal growth rate is over three times larger than its value in market equilibrium and that th...

In media markets, the value of advertisement exposure depends on circulation, and media consumers’ valuation is affected by advertising. This paper analyzes media market competition in a duopoly framework. There exist symmetric and asymmetric equilibria in terms of firm size, and sometimes a natural monopoly may emerge . There is less scope for asymmetry when products are more differentiated or...

Research and Teaching in Higher Education: Complements or Substitutes? In this note we use unique data from Bar-Ilan University, over a period of four years (20052008), to estimate simultaneous equations with regard to the relationship between publications and teaching loads. The study shows that students studying for a bachelor’s degree are a liability while PhD students are an asset in terms ...

The paper shows that in the presence of network externalities, consumers adopt conventional technologies too early; the waiting option for a newly emerging technology is not exercised enough. This problem is aggravated when the new technology is provided by a single producer with market power because any positive value created via waiting by current consumers will be ex post appropriated by the...

The physiological importance of translational regulation in controlling the synthesis of ribosomal proteins from the L11 ribosomal protein operon was determined for the classical regulatory phenomena of growth rate dependence and stringent control. Translational regulation of the L11 operon by ribosomal protein L1, the L11 operon-specific translational repressor protein, was abolished by introd...