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:

Pit-relocation of antlion larvae in relation to their density

Of the biotic factors potentially affecting the foraging behavior of pit-building antlion larvae,Myrmeleon bore Tjeder, we focussed on the density effects and examined experimentally influences of larval density on pit construction behavior, spatial distribution and pit relocation rate. Moreover the mechanism of mutual interference among larvae was examined.

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.

Political instability, gender discrimination, and population growth in developing countries

This paper introduces gender discrimination and population growth into a model of political economy. The government keeps up the military for the sake of political instability in the country. It is shown that if the risk of internal conflicts is high, then the government needs a bigger military and a larger supply of young men for it. The government is then willing to boost population growth by keeping women outside the production (e.g. neglecting their education or restricting their movement). Some empirical evidence on the interdependence of political instability, population growth, and gender discrimination is provided.

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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Heterogeneity in the intergenerational transmission of educational attainment: evidence from Switzerland on natives and second-generation immigrants

This study applies rich data from the 2000 Swiss census to investigate the patterns of intergenerational education transmission for natives and second-generation immigrants. The level of secondary schooling attained by youth aged 17 is related to their parents’ educational outcomes based on data on the entire Swiss population. Extending economic theories of child educational attainment, we derive hypotheses regarding the patterns of intergenerational education transmission. The data yield substantial heterogeneity in intergenerational transmission across population groups. Only a small share of this heterogeneity is explained by the predictions of economic theory.

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.

What Characterises Women Vulnerable to Chronic Energy Deficiency?

Weight-for-squared height or body mass index (BMI) is often considered as an effective predictor of morbidity and mortality rates. This study uses BMI data from a sample of ever-married women in the age group of 15–49 years in the North Indian state of Uttar Pradesh for the year 1998–1999, to analyse the determinants of chronic energy deficiency (CED) and estimate the population vulnerable to CED. The results highlight that CED rates and vulnerability rates can be very different, emphasizing need for policy intervention to focus on ‘potential’ CED persons. The characteristics of vulnerable population identified would be appropriate channels for policy intervention.

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.

Environmental defensive expenditures,expectations and growth

Nowadays many agents meet defensive expenditures to protect themselves against environmental deterioration. Such expenditures may contribute to support economic growth. Environmental degradation, in fact, may induce agents to work harder to replace depleted environmental goods with substitute goods. The consequent rise in the activity level may further deplete the environment, worsening the agents’ expectations on the future environmental quality and increasing their demand for substitute goods. To examine this issue, we adopt a simple model in which agents formulate expectations on the future environment that can be right or wrong and examine how such expectations influence capital accumulation and growth.

Measuring Youth Development: A Nonparametric Cross-Country ‘Youth Welfare Index’

This paper develops an empirical methodology for the construction of a synthetic multi-dimensional cross-country comparison of the performance of governments around the world in improving the livelihood of their younger population. The devised ‘Youth Welfare Index’ is based on the nonparametric Data Envelopment Analysis (DEA) methodology and allows for cross-country benchmarking and comparison over time. The value added of the youth index is to produce country-specific rankings and trace performance evolution with respect to indicators solely centered on youth, unlike other development indicators like the Human Development Index (HDI) which bundles many social and development indicators.

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.

Population aging and legal retirement age

This paper analyzes the effects of population aging on the preferred legal retirement age. What is revealed is the crucial role that the indirect ‘macro’ effects resulting from a change in the legal retirement age play in the optimal decision. Two social security systems are studied. Under a defined contribution scheme, aging lowers the preferred legal retirement age. However, under a defined pension scheme, the retirement age is delayed. This result shows the relevance of correctly choosing the parameter affected by the dependency ratio in the design of the social security programme.

Pathways from Casual Employment to Economic Security: the Australian Experience

Casual employment is extensive and has been increasing for more than two decades in Australia. The concept of casual employment used in the Australian context is unusual, but it is directly linked to benefit and rights exclusion within the regulatory framework governing employment. The expansion in casual employment has spread across all sectors, industries and occupations. Casual employment is associated with various forms of insecurity including income and employment insecurity. There are a number of ways in which the insecurity associated with casual employment could be reduced.

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.