Learn More
This paper examines direct broadcast satellites (DBS) as a competitor to cable. We first estimate a structural consumer level demand system for satellite, basic cable, premium cable and local antenna using micro data on almost 30 000 households in 317 markets, including extensive controls for unobserved product quality and allowing the distribution of(More)
A common thread in the theory literature on price discrimination has been the ambiguous welfare effects for consumers and the rise in profit for firms, relative to uniform pricing. In this study I resolve the ambiguity for consumers and quantify the benefit for a firm. A model of price discrimination is described which includes both second-degree and(More)
I address a recent critique by Corts [1999] who finds that traditional approaches in New Empirical Industrial Organization to estimate the competitive conduct in an oligopoly market can yield inconsistent estimates of the conduct parameter if firms are engaged in efficient collusion. This paper derives a general empirical model that allows consistent(More)
Consumer privacy and the market for customer information in electronic retailing are investigated. The value of customer information derives from the ability of firms to identify individual consumers and charge them personalized prices. Two settings are studied, an anonymity regime in which sale of customer information is not possible, and a recognition(More)
Deficiency in the guanine nucleotide exchange factor dedicator of cytokinesis 8 (DOCK8) causes a human immunodeficiency syndrome associated with recurrent sinopulmonary and viral infections. We have recently identified a DOCK8-deficient mouse strain, carrying an ethylnitrosourea-induced splice-site mutation that shows a failure to mature a humoral immune(More)
We use a representation of 3-D bodies derived from that used by Lang and Braid [ 3 ] . Body models are b u i l t up from two kinds of p r i m i t i v e s : the half-space H, defined as the set of points and the i defined as the set of points _ Bodies are represented as boolean combinations of sets r e s u l t i n g from transformations of the (perhaps(More)
This paper studies consumer search and pricing behavior in the British domestic electricity market following its opening to competition in 1999. We develop a sequential search model in which an incumbent and an entrant group compete for consumers who find it costly to obtain information on prices other than from their current supplier. We use a large data(More)
Patients with the dedicator of cytokinesis 8 (DOCK8) immunodeficiency syndrome suffer from recurrent viral and bacterial infections, hyper-immunoglobulin E levels, eczema, and greater susceptibility to cancer. Because natural killer T (NKT) cells have been implicated in these diseases, we asked if these cells were affected by DOCK8 deficiency. Using a mouse(More)
DOCK8 mutations result in an inherited combined immunodeficiency characterized by increased susceptibility to skin and other infections. We show that when DOCK8-deficient T and NK cells migrate through confined spaces, they develop cell shape and nuclear deformation abnormalities that do not impair chemotaxis but contribute to a distinct form of(More)
We disentangle the contribution of unobserved heterogeneity in idiosyncratic demand and productivity to firm growth. We use a model of monopolistic competition with Cobb-Douglas production and a dataset of Italian manufacturing firms containing unique information on firm-level prices to reach three main conclusions. First, demand shocks are at least as(More)