Learning in asymmetric duopoly markets: competition in information and market correlation

This paper explores experimentation and learning in asymmetric duopoly markets with product differentiation and demand uncertainty. We define the concepts of strategic substitutability and strategic complementarity in information and we show how both the mode of information competition and the transmission of information across markets affect duopoly experimentation. We relate information competition with market competition and we find that, when goods are substitutes and the correlation between market shocks is negative, firms will have a higher incentive to experiment in asymmetric markets than in symmetric ones. The opposite result follows when such correlation is positive. Also, when goods are complements the above findings are reversed.JEL Classification: D83, C72The authors thank partial financial support from the Spanish Ministry of Science and Technology under project B2000-1429, from the Spanish Ministry of Education and Science under project SEJ2004-07554 and from the “Generalitat Valénciana” under project GRUPOS04/13.     

Confirmatory factor analysis with missing data in a small sample: cognitive reserve in people with Down Syndrome

Quality & Quantity - The presence of missing data and small sample sizes are very common in social and health sciences. Concurrently to present a methodology to solve the small sample size and...     

The Influence of Image Valence on the Attention Paid to Charity Advertising

Non-governmental charities operate in a competitive market and survive with funding from membership fees and donations from supporters. Knowing and motivating potential donors has become increasingly important. Advertising is one of the key means of communication used by these organizations. This paper reports a pilot study to explore the influence of image valence in advertising on one’s attention and intention to donate. The study consists of an experiment wherein data processing is based on eye tracking and an electroencephalogram. The results show that negative images get more attention than text and logos. No differences were found with regard to gender and intention to donate in terms of attention paid to the advertising images. However, women do show greater willingness to make a donation. Finally, strategies adapted to charitable NGOs are discussed in the conclusions.     

The Struggle for a Voice: Tensions between Associations and Citizens in Participatory Budgeting

The emergence of new participatory mechanisms, such as participatory budgeting, in towns and cities in recent years has given rise to a conflict between the old protagonists of local participation and the new citizens invited to participate. These mechanisms offer a logic of collective action different from what has been the usual fare in cities — one based on proposal rather than demand. As a result, urban social movements need to transform their own dynamics in order to make room for a new political subject (the citizenry and the non‐organized participant) and to act upon a stage where deliberative dynamics now apply. This article aims to analyse this conflict in three different cities that set up participatory budgeting at different times: Porto Alegre, Cordova and Paris. The associations in the three cities took up a position against the new participatory mechanisms and demanded a bigger role in the political arena. Through a piece of ethnographic research, we shall see that the responses of the agents involved (politicians, associations and citizens) in the three cities share some arguments, although the conflict was resolved differently in each of them. The article concludes with reflections on the consequences this conflict could have for contemporary political theory, especially with respect to the role of associations in the processes of democratization and the setting forth of a new way of doing politics by means of deliberative procedures.     

Aggregation is not the solution: the PPP puzzle strikes back

Recently, Imbs, Mumtaz, Ravn and Rey (2005, hereinafter IMRR) have argued that much of the purchasing power parity (PPP) puzzle is due to upwardly biased estimates of persistence. According to them, the source of the bias is the existence of heterogeneous price adjustment dynamics at the sectoral level that established time series or panel data methods fail to control for. This paper re‐examines this claim in two steps. Firstly, we demonstrate that IMRR's measures of sectoral persistence are systematically downwardly biased because they are based on an inaccurate definition of the ‘average’ impulse response function (IRF). We then show that standard estimates of shock persistence are recovered after this bias is corrected. Secondly, building on the results in Mayoral (2008), which prove that aggregate and micro models induce the same shock persistence behavior, we show that estimates based on aggregate and sectoral exchange rates are, in fact, highly consistent. Thus, aggregation is not the solution to the PPP puzzle. Copyright © 2009 John Wiley & Sons, Ltd.     

ITQ Systems in Multifleet Fisheries

Optimum management of a particular fishery is analyzed based on an ITQ system. For this purpose, a multifleet deterministic bioeconomic model is developed and applied. Using data on the fishery studied here, estimates are made of the stock dynamics of fish and the technology used by the fleets operating in said fishery. Optimum levels of stock, effort and catch are determined. Finally, we present economic policy recommendations for this fishery and considerations for applying regulatory measures.     

Long- and Short-run Relationship Between Firm Creation and the Ease and Cost of Doing Business

Abstract

To promote private-sector growth, many countries have implemented reforms aimed at making it easier and less costly to do business. Using data from Philippine cities and municipalities from 2011 to 2015, this paper tested for the relationship between business creation and the ease and cost of doing business. The results provide evidence that the overall ease and cost of doing business is indeed associated with business creation, but the relationship becomes more apparent with disaggregation. In particular, lower cost of doing business is found to be a much stronger predictor of business creation than ease of doing business. The specific indicators that drive this relationship are minimum wage, price of electricity, price of water, and price of land from the “cost” dimension, and number of days to process a new business permit from the “ease” dimension. These relationships have implications on policy making, especially in designing programs that target firm creation.     

Healthcare resource utilization among commercially insured patients with cold agglutinin disease in the United States

Abstract

Aims: Cold agglutinin disease (CAD) is a rare subtype of autoimmune hemolytic anemia associated with increased thromboembolism risk and early mortality. Healthcare resource utilization (HRU) in CAD has not been reported. We aimed to compare HRU of patients with CAD with a matched non-CAD cohort in the United States.

Materials and methods: Patients with CAD were identified from 2006 to 2016 in the Optum-Humedica database using CAD terms in clinical notes and hematologist review. Patients were required to have Integrated Delivery Network records and ≥6 months’ follow-up before and after the first CAD mention date (index date). Patients with CAD were matched to a non-CAD cohort based on demographics. Multivariate analyses assessed inpatient hospitalizations, outpatient visits, emergency room visits, and transfusion use between cohorts 6 months before and 12 months after the index date.

Results: Of 814 patients with CAD, 410 met inclusion criteria and were matched to 3,390 patients without CAD. Mean age of patients with CAD was 68.0 years; approximately 62% were female. In the 12 months after the index date, mean inpatient hospitalizations (0.83 vs. 0.25), outpatient visits (17.26 vs. 6.77), emergency room visits (0.55 vs. 0.32), and transfusion days (1.05 vs. 0.05) were higher for patients with CAD than the matched non-CAD cohort (all p?<?.0001). Similarly, in the 6 months before the index date, patients with CAD had higher HRU than matched patients without CAD for all measures evaluated.

Limitations: Results of this study are based on patient information from the Optum-Humedica database, which is limited to commercially insured patients and may not represent the overall CAD population.

Conclusions: CAD places a substantial burden on patients and healthcare systems. In addition, the high HRU for patients with CAD observed in the 6 months before diagnosis indicates that disease awareness and better diagnostic practices may be needed.