Competition and educational quality: Evidence from the Netherlands

Ample evidence is available for the effect of competition on educational quality as only a few countries allow large scale competition. In the Netherlands free parental choice is present since the beginning of the 20th century, which can be characterized as a full voucher program with 100% funding. Based on panel data for the Netherlands we show that there is a relation between competition and educational outcomes in secondary education, but that it is negative and small. This effect is larger for small and medium sized schools and for schools which do not have a Protestant or Catholic denomination

Industrie- en dienstenbeleid: een nadere verdieping

In dit onderzoek wordt een overzicht gegeven van de wetenschappelijke stand van zaken op het gebied van het industrie- en dienstenbeleid. In dat kader komt een drietal verschillende invalshoeken aan de orde, namelijk een internationale vergelijking van de beleidspraktijk, het debat over 'competitiveness' en het onderscheidende karakter van industrie- en dienstenbeleid. Om te beginnen wordt de beleidspraktijk van een aantal OESO-landen nader bekeken. Uit deze vergelijking komt naar voren dat in de ge?ndustrialiseerde wereld grofweg drie typen industriebeleid onderscheiden kunnen worden: het Angelsaksische, Rijnlandse en Mediterrane model. Traditioneel verschillen deze prototypen sterk van elkaar wat betreft doelstellingen, instrumenten, institutionele vormgeving en aandachtspunten in het beleid. Toch lijkt er momenteel sprake te zijn van een zekere mate van beleidsconvergentie. Zo is het industrie- en dienstenbeleid van veel landen tegenwoordig gericht op het versterken van de 'competitiveness' van de nationale economie. Van dit begrip bestaat echter geen eenduidige definitie. Sommige auteurs brengen het concurrentievermogen van een land in verband met exogene comparatieve voordelen, terwijl anderen wijzen op het belang van endogeen bepaalde competitieve voordelen. Binnen de laatste stroming verschilt men bovendien van mening of het landen of juist bedrijven zijn die met elkaar concurreren. Deze verschillende stromingen komen ieder tot een andere invulling van het begrip industriebeleid. Tenslotte wordt in het voorliggende onderzoeksrapport aandacht geschonken aan het specifieke karakter van industrie- en dienstenbeleid ten opzichte van andere vormen van overheidsbeleid. Een belangrijk aspect hierbij is dat veelal getracht wordt met behulp van industriebeleid bepaalde vormen van marktfalen te corrigeren. Gezien het feit dat het niet mogelijk is een pasklaar antwoord te geven op de vraag wat industrie- en dienstenbeleid nu feitelijk inhoudt, worden verschillende kennislacunes gesignaleerd. Het onderzoek wordt afgesloten met een aantal vragen die in vervolgonderzoek beantwoord zouden moeten worden

Is there still collusion in the Dutch waste collection market?

Concentration indexes based on regional markets show that the Dutch market for refuse collection is highly concentrated in 2002 and 2010. Similar to earlier work in 2007, the results indicate some evidence that high concentration increases costs and therefore (partly) offsets the advantage of contracting out. In 2002, results with respect to concentration are somewhat less robust. In 2010, the cost-advantage effect of private provision becomes smaller. However, for this year, we have a stronger indication that the cost advantage of private provision depends negatively on regional concentration measured by the Hirschman–Herfindahl Index

Opportunities and challenges in using instrumental variables to study causal effects in nonrandomized stress and trauma research.

OBJECTIVE: Researchers are often interested in assessing the causal effect of an exposure on an outcome when randomization is not ethical or feasible. Estimating causal effects by controlling for confounders can be unconvincing because important potential confounders remain unmeasured. Study designs leveraging instrumental variables (IVs) offer alternatives to confounder-control methods but are rarely used in stress and trauma research. METHOD: We review the conceptual foundations and implementation of IV methods. We discuss strengths and limitations of IV approaches, contrasting with confounder-control methods, and illustrate the relevance of IVs for stress and trauma research. RESULTS: IV approaches leverage an external or exogenous source of variation in the exposure. Instruments are variables that meet three conditions: relevance (variation in the IV is associated with variation in the chance of exposure), exclusion (the IV only affects the outcome through the exposure), and exchangeability (no unmeasured confounding of the IV-outcome relationship). Interpreting estimates from IV analyses requires an additional assumption, such as monotonicity (the instrument does not change the chance of exposure in different directions for any two individuals). Valid IVs circumvent the need to correctly identify, measure, and control for all confounders of the exposure-outcome relationship. The primary challenge is identifying a valid instrument. CONCLUSIONS: IV approaches have strengths and weaknesses compared with confounder-control approaches. IVs offers a promising complementary study design to improve evidence about the causal effects of exposures on outcomes relevant to stress and trauma. Collaboration with scientists who are experienced with identifying and analyzing IVs will support this work. (PsycInfo Database Record (c) 2023 APA, all rights reserved)

School Choice and Competition

The literature suggests that competition among schools might increase quality. However, not much empirical evidence is present as only a few countries allow competition at a large scale. One exception is the Netherlands. Free parental choice is the leading principle of the Dutch education system since the beginning of the 20th century. Based on panel data for the Netherlands we show that there is a relation between competition and student achievement in upper secondary education, but that it is negative. In addition, private schools have higher quality levels

Collusion in the Dutch waste collection market

In this paper we analyse whether collusion exists in the Dutch waste collection market, which shows a high degree of concentration. Although scale effects might be in accordance with this market outcome, the question is whether this concentration is in fact a result of fair competition. Using data for (nearly) all Dutch municipalities we estimate whether collusion exists and what the impact is on tariffs for waste collection. The results indicate that high concentration increases prices and therefore (partly) offsets the advantage of contracting out. The presence of competing public firms might be essential to ensure more and fair competition.Waste collection, collusion, public-private firms, contracting out

Deviations in influenza seasonality: odd coincidence or obscure consequence?

AbstractIn temperate regions, influenza typically arrives with the onset of colder weather. Seasonal waves travel over large spaces covering many climatic zones in a relatively short period of time. The precise mechanism for this striking seasonal pattern is still not well understood, and the interplay of factors that influence the spread of infection and the emergence of new strains is largely unknown. The study of influenza seasonality has been fraught with problems. One of these is the ever-shifting description of illness resulting from influenza and the use of both the historical definitions and new definitions based on actual isolation of the virus. The compilation of records describing influenza oscillations on a local and global scale is massive, but the value of these data is a function of the definitions used. In this review, we argue that observations of both seasonality and deviation from the expected pattern stem from the nature of this disease. Heterogeneity in seasonal patterns may arise from differences in the behaviour of specific strains, the emergence of a novel strain, or cross-protection from previously observed strains. Most likely, the seasonal patterns emerge from interactions of individual factors behaving as coupled resonators. We emphasize that both seasonality and deviations from it may merely be reflections of our inability to disentangle signal from noise, because of ambiguity in measurement and/or terminology. We conclude the review with suggestions for new promising and realistic directions with tangible consequences for the modelling of complex influenza dynamics in order to effectively control infection

Report on the Joint Workshop on the Relations between Health Inequalities, Ageing and Multimorbidity, Iceland, May 3-4, 2023

This paper is a summary of key presentations from a workshop in Iceland on May 3– 4, 2023 arranged by Aarhus University and with participation of the below-mentioned scientists.Below you will find the key messages from the presentations made by:Professor Jan Vandenbroucke, Department of Clinical Epidemiology, Aarhus University, Emeritus Professor, Leiden University; Honorary Professor, London School of Hygiene & Tropical Medicine, UKProfessor, Chair Henrik Toft Sørensen, Department of Clinical Epidemiology, Aarhus University and Aarhus University Hospital, DenmarkProfessor David H. Rehkopf, Director, the Stanford Center for Population Health Sciences, Stanford University, CA., USProfessor Jaimie Gradus, Department of Epidemiology, School of Public Health, Boston University, Boston, Massachusetts, USProfessor Johan Mackenbach, Emeritus Professor, Department of Public Health, Erasmus University Rotterdam, HollandProfessor, Chair M Maria Glymour, Department of Epidemiology, Boston University School of Public Health, Boston University, Boston, Massachusetts, USProfessor, Dean Sandro Galea, School of Public Health, Boston University, Boston, Massachusetts, USProfessor Victor W. Henderson, Departments of Epidemiology & Population Health and of Neurology & Neurological Sciences, Stanford University, Stanford, CA, US; Department of Clinical Epidemiology, Aarhus University, Aarhus, D