Environmental security and labor migration in Nepal

Do changes in environmental security that result from declining access to forest resources shape labor migration in a context where household production and consumption are intimately dependent on natural resources? Using 1996 household data from the Chitwan Valley of Nepal, we examined if a decrease in access to firewood increased the likelihood of migration of individuals for work. The results of multinomial logistic regression showed that, environmental insecurity was a significant predictor for migration regardless of destination, domestic or international. Labor requirements for household maintenance also played an important role in the decision to migrate. Management of forest resources and poverty alleviation by providing firewood substitutes and economic opportunities at the local level is likely to change the labor migration flow, which could be an important issue for future research.     

Books and publications received

Efforts to control rampant population growth in sub-Saharan Africa have been stymied by confusion between the potential causes and consequences of high fertility in the region. A controversy has surfaced over the causal direction of the fundamental relationship between human fertility and size of landholdings. Members of one school of thought claim that farm couples modify their fertility behaviour according to the amount of land they own or operate. Yet others argue that the size of landholdings varies as a function of family size (an indicator of the availability of family labour). In the present study we use a two-stage least-squares regression on data from a 1988 survey of 747 farm households in Rwanda to disaggregate and compare the strengths of these two possible paths of influence. The results show that landholdings exert a positive influence on human reproduction, but not the reverse. Moreover, this influence is slightly stronger for couples who own all the land they operated, probably because they have larger incomes from equity in the land. The size of the farm is unrelated to the size of the family's potential farm labour force (measured as the number of household members aged 15–65) or to the husband's total desired number of children. These findings suggest that farm size boosts the number of living children not by creating a demand for more children but by increasing the supply of children through higher natural fertility and child survival.     

The Determinants of Low Fertility in India

Using a conceptual framework focusing on factors that enhance or reduce fertility relative to desired family size (see Bongaarts 2001), we study fertility variation across time (1992–2006) and space (states) in India. Our empirical analyses use data from three waves of the Indian National Family Health Surveys. We find that this framework can account for a substantial portion of the variation in the total fertility rate (TFR) over time and across states. Our estimates focus attention on the critical components of contemporary Indian fertility, especially desired family size, unwanted fertility, son preference, and fertility postponement.     

Land and leña: linking transnational migration, natural resources, and the environment in Guatemala

This article examines the relationships between international migration, natural resources, and the environment. Rather than looking at environmental change as a cause of population movements, the article reveals how migration affects the environment in sending countries. Empirically, we rely on a case study in Guatemala. Although migrants and cash remittances make significant contributions to Guatemala’s changing economy, little is known about the relationships between migration and the environment in this Central American country—a country, which continues to have a large rural population and that relies heavily on its natural resources. Drawing on ethnographic research and household surveys in a Maya community, we reveal how migrants and their earnings, as well as their ideas, behavior and attitudes, affect land use, land cover, and firewood use. We reveal, for example, how in addition to investments in land for home building and pick-up trucks to help improve agricultural production, some migrant households purchase more land and often dedicate it to the cultivation of vegetable crops for local and foreign markets. Cultural practices and beliefs directly linked to land and the environment, particularly maize cultivation, also alter due to migration processes. And, despite the ability of migrant households to transition to more efficient fuels like liquid propane gas (LPG), we show how they continue to use firewood. In all, the study contributes important insights into the environmental implications of migration.     

Family Size,Cognitive Outcomes,and Familial Interaction in Stable,Two-Parent Families: United States, 1997–2002

Measures of children’s time use, particularly with parents and siblings, are used to evaluate three hypotheses in relation to the vocabulary and mathematical skills development: (1) the resource dilution hypothesis, which argues that parental and household resources are diluted in larger families; (2) the confluence hypothesis, which suggests that the intellectual milieu of families is lowered with additional children; and (3) the admixture (“no effect”) hypothesis, which suggests that the negative relationship between family size and achievement is an artifact of cross-sectional research resulting from unobserved heterogeneity. Each hypothesis is tested using within-child estimates of change in cognitive scores over time with the addition of new children to families.     

The Differential Mortality of Undesired Infants in Sub-Saharan Africa

With high rates of infant mortality in sub-Saharan Africa, investments in infant health are subject to tough prioritizations within the household, in which maternal preferences may play a part. How these preferences will affect infant mortality as African women have ever-lower fertility is still uncertain, as increased female empowerment and increased difficulty in achieving a desired gender composition within a smaller family pull in potentially different directions. I study how being born at a parity or of a gender undesired by the mother relates to infant mortality in sub-Saharan Africa and how such differential mortality varies between women at different stages of the demographic transition. Using data from 79 Demographic and Health Surveys, I find that a child being undesired according to the mother is associated with a differential mortality that is not due to constant maternal factors, family composition, or factors that are correlated with maternal preferences and vary continuously across siblings. As a share of overall infant mortality, the excess mortality of undesired children amounts to 3.3 % of male and 4 % of female infant mortality. Undesiredness can explain a larger share of infant mortality among mothers with lower fertility desires and a larger share of female than male infant mortality for children of women who desire 1–3 children. Undesired gender composition is more important for infant mortality than undesired childbearing and may also lead couples to increase family size beyond the maternal desire, in which case infants of the surplus gender are particularly vulnerable.     

External Shocks,Household Consumption and Fertility in Indonesia

This paper examines the impact of idiosyncratic income shocks on household consumption, educational expenditure and fertility in Indonesia, and assesses whether the investment in human capital of children and fertility are used to smooth household consumption. Using four different kinds of self-reported economic hardships, our findings indicate that coping mechanisms are rather efficient for Indonesian households that perceive an economic hardship. Only in case of unemployment do we find a significant decrease in consumption spending and educational expenditure while fertility increases. These results indicate that households that perceive an unemployment shock use children as a means for smoothing consumption. Regarding the death of a household member or natural disaster we find that consumption per person even increases. These results are consistent with the argument that coping mechanisms even over-compensate the actual consumption loss due to an economic hardship. One important lesson from our findings is that different types of income shock may lead to different economic and demographic behavioral adjustments and therefore require specific targeted social insurance programs.     

Bargaining over family size: The determinants of fertility in Brazil

Understanding how households make fertility decisions is important to implementing effective policy to slow population growth. Most empirical studies of this decision are based on household models in which men and women are assumed to act as if they have the same preferences for the number of children. However, if men and women have different preferences regarding fertility and are more likely to assert their own preferences as their bargaining power in the household increases, policies to lower fertility rates may be more effectively targeted toward one spouse or the other. In this paper, we test the relevance of the single preferences model by investigating whether men and women's nonwage incomes have the same effects on the number of children in the household. We find that while increases in both the man and woman's nonwage income lower the number of children in the household, an equivalent increase in the woman's income has a significantly stronger effect than the man's. In addition, we find that increases in women's nonwage transfer income have the strongest effects on the fertility decisions of women with low levels of education. The most important policy implication of our results is that policies aimed at increasing the incomes of the least-educated women will be the most effective in lowering fertility rates.     

Fertility and desired fertility: Longitudinal evidence from Thailand

Summary The validity and usefulness of 'desired additional children' and 'ideal family size' as predictors of fertility are analysed in this paper on the basis of longitudinal survey data from Thailand. First, the extent of measurement error in these variables is considered, and it is concluded that the error variance and the true variance are of similar orders of magnitude. Secondly, the changes in attitudes subsequent to births and deaths of children are investigated. It is found that the number of additional children desired is decreased by births and increased by deaths, but less than would be expected if 'desired additional children' represented an unchanging target family size. 'Ideal family size' is almost unaffected by births and deaths. Thirdly, the contribution of attitudinal variables to behavioural models is examined. It is found that desired fertility is explained no better than fertility in a standard economic model. A birth function separating desired children from identifiable physiological factors as explanatory variables indicated that the former was just significant. A model of contraceptive acceptance also found desired fertility to be a significant determinant. Thus, desired fertility can be successfully integrated into behavioural models. But on the whole, its explanatory power was weak, and it was concluded that the independent use of this variable does not significantly improve on models which relate fertility to socio-economic variables directly.     

Poverty in the Philippines: the impact of family size

The people of Asia are beginning to realize that lower fertility translates into increased family wealth and educational attainment. This is the message that population and development efforts have been focusing on. In the Philippines, the goal is to lower fertility with a strategy based on the assumption that increased capacity of the economy will support a growing population at a higher standard of living. In the Philippines, over 33% of the households have 7 or more family members, while 20% of urban and 27% of rural households have 4 or more. The risk of poverty associated with increased number of children are 44-50% for 1 child and 60-78% for those with 5. Households spend up to 10% of their total income to raise 1 child, 18% for 2, and 26% for 4 children. Because many families lack the resources to raise children the per child share drops dramatically with each child, a household with 4 children spends 25% less per child than does 1 with 2 children. Occupation also affects income as the highest poverty rates are among heads of household who are: laborers (60%) and agricultural workers (73%). The best solution is an integrated approach with increases in family planning, education, and agricultural reform.     

The prediction of completed fertility

There has been considerable interest in the relation between familysize desires and completed fertility. Longitudinal data from the Princeton Fertility Study provide a unique opportunity to compare the number of children desired after the birth of a second child to the size of completed families. The average number of children desired by women after the birth of their second child predicts very well the average size of their completed families. The average family size desired at the first interview and average estimated completed family size some eight years later are identical for the total sample, and vary hardly at all within religious or education subgroups. One-third of the variance in the completed fertility of couples is "explained" by wife's family-size desires and the proportion of explained variance increases to two-fifths when we include the husband's first interview desires and the interval between marriage and second birth. Yet in spite of the relatively high correlation between desires and achievement, only 41 percent of these women achieved exactly the number of children they desired at the first interview, while 14 percent had two children more or fewer than originally desired. Nevertheless, data on contraceptive efficiency indicate that desires after the birth of the second child constitute meaningful goals in terms of which the respondents regulate their subsequent behavior-efficacy of contraceptive practice shows substantial improvement after the desired number has been achieved.     

Young Women’s Dynamic Family Size Preferences in the Context of Transitioning Fertility

Dynamic theories of family size preferences posit that they are not a fixed and stable goal but rather are akin to a moving target that changes within individuals over time. Nonetheless, in high-fertility contexts, changes in family size preferences tend to be attributed to low construct validity and measurement error instead of genuine revisions in preferences. To address the appropriateness of this incongruity, the present study examines evidence for the sequential model of fertility among a sample of young Malawian women living in a context of transitioning fertility. Using eight waves of closely spaced data and fixed-effects models, we find that these women frequently change their reported family size preferences and that these changes are often associated with changes in their relationship and reproductive circumstances. The predictability of change gives credence to the argument that ideal family size is a meaningful construct, even in this higher-fertility setting. Changes are not equally predictable across all women, however, and gamma regression results demonstrate that women for whom reproduction is a more distant goal change their fertility preferences in less-predictable ways.     

Cheaper by the dozen? The marginal time costs of children in the Philippines

The important relationship between fertility rates and economic development has prompted many researchers to try and better understand the determinants of family size. It has repeatedly been shown that the costs of children, both direct and indirect, are one of the most important determinants of fertility, exerting a significantly negative effect on birth rates in both developed and developing countries. Many studies which investigate the relationship between the costs of children and family size have assumed that these costs do not vary with parity. However, there is substantial evidence that the marginal costs of children are not constant but decrease with birth order in developed countries. In this paper, the hypothesis that there are diminishing marginal time costs of children is tested using household data from the developing country setting of the Philippines. By examining the determinants of additional time spent in childcare before and after the birth of a child, it is found that the marginal time costs are not the same across households of various sizes. Firstborn children cost significantly more in terms of additional mother's time than children of higher birth orders. In addition, the time costs of the second child are found to be significantly greater than those of the third child. However, these economies of scale in childcare are limited and do not extend beyond three children. The effect of birth spacing on the marginal time costs of children is also found to be significant.     

中国大城市不同人群生育意愿的 变迁趋势及比较研究 ——以上海市为例

生育意愿研究有水平研究和趋势研究两个视角,后者更能反映人们观念的变迁,更能预判未来生育水平的变动。文章以上海市为例,采用横断历史元分析法(Cross-temporal meta-analysis),将1981年以来的30多年间上海市范围内开展的26项涉及居民生育意愿调查的结果串联起来,结合其中5项调查的个案数据分析,考察我国大城市不同社会经济特征人群的生育意愿纵向变化趋势并进行子人群间的比较。研究发现20世纪80年代以来上海户籍城乡居民的生育意愿均不断减弱并且二者逐渐趋同,生育意愿的"城乡之别"已然消失;在沪外省市流动人口的生育意愿强于户籍人口,"内外之分"仍然存在,但也显示出未来有趋同的可能性;独生子女与非独生子女的生育意愿比较显示户籍人口中独生子女与非独生子女的生育意愿差异极小,流动人口中非独生子女的生育意愿略强于独生子女;从不同文化程度和收入水平的人群比较来看,文化程度越高的户籍人口生育意愿越强,流动人口的生育意愿随文化程度的提高呈现"两头高、中间低"的特征,无论是户籍人口还是流动人口,高收入人群的生育意愿均相对较高;但是无论哪个人群的平均意愿子女数均已低于2个孩子。     

How female literacy affects fertility: the case of India

Recent studies indicate that there is a direct correlation between increased literacy and decreased fertility. This link was demonstrated in study that covered 90% of India's population. Studies in other developing countries have confirmed this finding. In addition, high literacy rates have been found to correspond to high infant survival rates. Researchers also found that there was little change in the relationship between literacy and fertility when they were both controlled for different levels of urbanization. The problem is that only 1 in 4 Indian women are literate. However, India's government has a program in place the goal of which is to have universal literacy. In Kerala, female literacy is the highest (65%). And at 3.4 children/women, it has 1 of the lowest fertility rates. For the 14 states studied, the total fertility rate was 5.0 children/woman, the child mortality rate was 126/1000, and the female literacy rate was 22%. In contrast in Rajasthan where female literacy is 11% (the lowest of the 14 states studied) fertility is the highest at 6.0 children/woman. No state with higher than average fertility had higher than average female literacy rates. Literate women are likely to have more surviving children because they are more aware of good health practices, and they tend to live in better circumstances. As a result, couples need fewer births to reach their desired family size.     

The Effect of Fertility Reduction on Economic Growth

We assess quantitatively the effect of exogenous reductions in fertility on output per capita. Our simulation model allows for effects that run through schooling, the size and age structure of the population, capital accumulation, parental time input into childrearing, and crowding of fixed natural resources. The model is parameterized using a combination of microeconomic estimates and standard components of quantitative macroeconomic theory. We apply the model to examine the effect of a change in fertility from the UN medium‐variant to the UN low‐variant projection in Nigeria. For a base case set of parameters, we find that such a change would raise output per capita by 5.6 percent at a horizon of 20 years and by 11.9 percent at a horizon of 50 years. We conclude with a discussion of the quantitative significance of these results.     

The Evolution of Family Complexity from the Perspective of Nonmarital Children

We document the incidence and evolution of family complexity from the perspective of children. Following a cohort of firstborn children whose mothers were not married at the time of their birth, we consider family structure changes over the first 10 years of the child’s life—considering both full and half-siblings who are coresidential or who live in another household. We rely on detailed longitudinal administrative data from Wisconsin that include information on the timing of subsequent births to the mother and father, and detailed information on earnings, child support, and welfare. We find that 60% of firstborn children of unmarried mothers have at least one half-sibling by age 10. Our results highlight the importance of having fertility information for both fathers and mothers: estimates of the proportion of children with half-siblings would be qualitatively lower if we had fertility information on only one parent. Complex family structures are more likely for children of parents who are younger or who have low earnings and for those in larger urban areas. Children who have half-siblings on their mother’s side are also more likely to have half-siblings on their father’s side, and vice versa, contributing to very complex family structures—and potential child support arrangements—for some children.     

Land cover change and fertility in West-Central Africa: rural livelihoods and the vicious circle model

The vicious circle argument, rooted in a neo-Malthusian tradition, states that resource scarcity increases the demand for child labor and leads to higher fertility. The rural livelihood framework, on the other hand, contends that households employ multiple strategies, only one of which involves adjusting their fertility levels as a response to environmental pressures. This study provides a unique test of both theories by examining the relationship between land cover change and fertility across hundreds of rural communities in four West-Central African countries. The findings reveal a complex relationship between natural capital and fertility. In communities where natural capital was initially low, a further decline in that capital is associated with both higher fertility preferences and levels. However, we find that fertility preferences and behavior are often discordant, with notable within-community differences in response to decline in natural capital across levels of household wealth.     

Determined to stop? Longitudinal analysis of the desire to have no more children in rural Mozambique

Classic demographic theories conceptualize desired family size as a fixed goal that guides fertility intentions over the childbearing years. However, a growing body of research shows that fertility plans, even nominally long-term plans for completed childbearing, change in response to short-term conditions. Because of data limitations, much of this research has focused on low-fertility contexts, but short-term conditions are likely to be even more important in high-fertility contexts. This paper uses three waves of survey data collected in rural Mozambique to study predictors of the desire to stop childbearing in a context of relatively high fertility and high individual and social instability. We use fixed effects models to assess how women’s desires to stop childbearing are shaped by demographic factors, household economic conditions, and health status, controlling for constant individual characteristics. Results provide evidence that fertility desires both reflect stable underlying goals and evolve in response to individual and social circumstances.     

Comparison and fairness in family planning]

There are two kinds of comparison in family planning (FP) practice. First, people compare the number of children they have with their desired family size. Second, people compare their number of children with other's. The extent of their satisfaction from the comparison often depends on their expectation. And people's expectation about their family size may have an impact on the level of fertility. One task in a FP program is to regulate people's objects for comparison and to reduce the number of children they expect to have. But, changes in people's desired number of children are largely dependent upon the socio economic charges which can not be achieved in short time. Therefore, it would be more advisable to direct people to compare their fertility behavior with those of couples who have only one child, rather than those who have 3 or 4. Satisfaction with family size also comes from a feeling of fairness. People not only look at what they get, but also at what others get. Fairness and justice in FP program implementation is important. If those who violate local birth control policies and regulations are not properly punished, other people would feel that the situation is unfair and they would regret that they did not do the same. The pressure brought by over-population to socio-economic development has been gradually felt by most people. But, it is still difficult to have them strictly observe the present fertility regulation policy. If restrictions of various kinds are enforced and education and publicity are used, people will feel that they are being treated fairly. This will facilitate the promotion of the FP program.