Tests of four hypotheses on soldier production, by using wild colonies ofPheidole fervida F. Smith (Hymenoptera: Formicidae)

Following four hypotheses on the production of soldiers were tested in thePheidole fervida colonies collected in the natural field:

Structural elements of material well-being: An empirical test among people on social security

The paper reports on a study of indicators of well-being, including objective indicators of well-being, global, affective indicators of well-being, and indicators of socio-economic well-being. Socioeconomic well-being is (narrowly) defined as that part of the individual's universal well-being which is strongly related to money and material means.It was hypothesized that these 3 classes of indicators of well-being have different meanings for the various groups of people on social security. Therefore, data were collected from a Dutch, nationally representative sample of 3 categories of individuals drawing benefits, namely: people receiving social benefits; unemployed, and disabled people, and a group of people in work. Hypotheses were tested regarding the following issues:

Population Density is a Key Factor in Declining Human Fertility

In studying the complex determinants of human fertility, social scientists have given little attention to population density, although reproduction has been shown to be density-dependent for a wide variety of other species. Using fixed effects models on the time series of 145 countries and controlling for key social and economic variables, we find a consistent and significant negative relationship between human fertility and population density. Moreover, we find that individual fertility preferences also decline with population density. These findings suggest that population density should be included as a variable in future studies of fertility determinants.

Avowed Happiness in Confucian Asia: Ascertaining its Distribution,Patterns, and Sources

This study reviewed three philosophical accounts of happiness, and then tested those accounts with the Asiabarometer surveys conducted in six Confucian societies during the summer of 2006. Statistical analyses of these surveys reveal that East Asians tend to experience happiness to a greater extent when they experience enjoyment together with achievement and/or satisfaction. The preponderance of such multi-dimensional conceptions in all those societies poses a direct challenge to a single dimensional account of happiness in the West. The analyses also reveal that positive assessments of interpersonal relationships matter more than the amount of knowledge or wealth in living a happy life in Confucian societies.

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The changing nature of wage inequality

The paper reviews recent developments in the literature on wage inequality with a particular focus on why inequality growth has been particularly concentrated in the top end of the wage distribution over the last 15 years. Several possible institutional and demand-side explanations are discussed for the secular growth in wage inequality in the United States and other advanced industrialized countries.

Population, population density and technological change

In a model on population and endogenous technological change, Kremer (1993) combines a short-run Malthusian scenario where income determines the population that can be sustained, with the Boserupian insight that greater population spurs technological change and can therefore lift a country out of its Malthusian trap. We show that a more realistic version of the model, which combines population and population density, allows deeper insights into these processes. The incorporation of population density also allows a superior interpretation of the empirical regularities between the level of population, population density, population growth, and economic development at aggregated and disaggregated levels.

Volunteerism and residential longevity in Saskatoon,Saskatchewan, Canada

This paper examines volunteerism across three neighbourhood types that are differentiated by socio-economic status (SES) in Saskatoon, Saskatchewan, Canada. The three neighbourhood types are defined as Low, Middle and High SES. The study used data collected from two telephone surveys (n = 968 in 2001, n = 997 in 2004) using random-digit dialling, together with in-depth interview data collected from a selected set of survey participants (n = 90). Neighbourhood type and length of residence are shown to have a strong bearing on volunteerism. The interview data illustrates that the quality of volunteer activity that residents engage in differs across neighbourhood types.

The earned income tax credit and fertility

Government programs designed to provide income safety nets often restrict eligibility to families with children, creating an unintended fertility incentive. This paper considers whether dramatically changing incentives in the earned income tax credit affect fertility rates in the USA. We use birth certificate data spanning the period 1990 to 1999 to test whether expansions in the credit influenced birthrate among targeted families. While economic theory would predict a positive fertility effect of the program for many eligible women, our results indicate that expanding the credit produced only extremely small reductions in higher order fertility among white women.

Exploring patterns of environmental injustice in the Global South: <Emphasis Type="Italic">Maquiladoras</Emphasis> in Ciudad Juárez,Mexico

Decades of research in countries of the Global North have revealed distinct environmental injustices whereby industrial hazards tend to be located in poor and minority neighborhoods; few studies have investigated similar relationships between humans and hazards in the Global South. This study uses conventional quantitative environmental justice methodology to investigate spatial relationships between residential socio-demographics and maquiladoras (i.e., final assembly plants) in Ciudad Juárez, Mexico. When predicting maquiladora density using percent children and social class in a spatial error regression model, we find that percent children was a positive and significant predictor, while social class was not significant. Adding formal residential development to the model, social class becomes a negative and significant predictor. Formal residential development and percent children are also positive and significant. As is the case in the Global North, relationships between neighborhood characteristics and transnationally operated maquiladoras along the northern border of Mexico are linked to urban development.

Enclaves, language, and the location choice of migrants

Empirical studies in the migration literature have shown that enclaves (networks) negatively affect the language proficiency of migrants. Most of these studies do not address the choice of location as a function of language skills. Using data on Mexican migration to the US, we show that migrants choose smaller networks as their English language proficiency improves.

How important is homeland education for refugees’ economic position in The Netherlands?

We use data on refugees admitted to The Netherlands that include registration of education in their homeland by immigration officers. Such data are seldom available. We investigate the quality and reliability of the registrations and then use them to assess effects on refugees’ economic position during the first 5 years after arrival. The most remarkable finding is the absence of returns to higher education.

NIVAH: a composite index measuring violence and harm in the U.S.

The National Index of Violence and Harm (NIVAH) tracks levels of violence and harm in the United States and identifies trends over the study period 1995–2003. NIVAH is comprised of nineteen variables in the areas of interpersonal, intrapersonal, institutional and structural violence and harm as experienced by people in the U.S. Two composite indexes are formed to describe overall trends in the realms of personal and societal violence. In addition to describing the Index’s construction and most recent conclusions, various methodological issues and their impacts on index findings are investigated.

The Catalan premium: language and employment in Catalonia

In this paper, I measure the contribution of knowing Catalan to finding a job in Catalonia. In the early 1980s, a drastic language policy change (normalització) promoted the learning and use of Catalan in Catalonia and managed to reverse the falling trend of its relative use vs Castilian (Spanish). Using census data for 1991 and 1996, I estimate a significant positive Catalan premium: the probability of being employed increases between 3 and 5 percentage points if individuals know how to read and speak Catalan; it increases between 2 and 6 percentage points for writing Catalan.

The new economics of education: methods,evidence and policy

In this paper (my keynote talk from the 2006 ESPE conference), I discuss the recent upsurge in research on the economics of education that has occurred, especially in Europe. I discuss the reasons for the increased interest and present some examples from my recent research in the area. The paper concludes that the increased research interest seems likely to be sustained for some time to come.

Resource management and fertility in Mexico’s Sian Ka’an Biosphere Reserve: <Emphasis Type="Italic">Campos</Emphasis>, cash,and contraception in the lobster-fishing village of Punta Allen

This case study examines the link between marine resource management, and the universal contraceptive use among married couples in the lobster-fishing village of Punta Allen, located in the Sian Ka’an Biosphere Reserve, Quintana Roo, Mexico. Several reasons appear to contribute to small desired and actual family sizes. Some of these include a medical clinic staff effective in promoting family planning, cooperative and private resource ownership, changing cultural attitudes, geographical limitations to population and economic growth, and a desire to conserve the environment for aesthetic and economic motives. Lastly, families desired to preserve a sustained balance between benefiting from lobster harvests today and safeguarding this marine resource for their children in the future.