Voodoo forecasting: Technical,political and ethical issues regarding the projection of local population growth

The case of an energy production community in Colorado is used to illustrate a) the great need for reliable subnational population forecasts, especially in communities expecting rapid population growth, and b) why such projections, as currently performed, cannot be reliable. Explanations for failure in forecasting are found in the methods themselves, the unavailability and unreliability of key data, politics, and the intrusion of the designers' and users' values into the forecasting models. As one solution it is proposed that forecasting be reconceptualized from a technical to an ethical issue and that it be based upon an active rather than a passive planning/forecasting philosophy. As such, the community and industry would set a desired, realistic goal, and forecasting models would be run backwards to determine the economic-demographic paths by which this goal could be achieved.     

The influence of first generation fertility and economic status on second generation fertility

This paper examines the impact of parental economic status and family size on the actual and expected fertility of adult children using longitudinal data from two generations of families participating in the Panel Study of Income Dynamics. There was a modest positive relationship between first generation family size and second generation fertility. More importantly, the ideal family size of the parental family was more closely related to fertility behavior and plans in the second generation than was actual parental family size. In addition, the data revealed the hypothesized negative correlation between parental financial status and second generation fertility behavior and plans. Several mechanisms which could produce the correlation between parental characteristics and the fertility of their children are explored.The analysis reported in this paper was supported by Contract NO1-HD-42856 from the National Institute for Child Health and Human Development, Center for Population Research. Dr. Thornton is affiliated with the Survey Research Center, Institute for Social Research, University of Michigan, Ann Arbor, MI 48106. Requests for reprints should be directed to him.     

Pensions and fertility: back to the roots

Fertility has long been declining in industrialised countries and the existence of public pension systems is considered as one of the causes. This paper provides detailed evidence on the mechanism by which a public pension system depresses fertility, based on historical data. Our theoretical framework highlights that the effect of a public pension system on fertility is ex ante ambiguous while its size is determined by the internal rate of return of the pension system. We identify an overall negative effect of the introduction of pension insurance on fertility using regional variation across 23 provinces of Imperial Germany in key variables of Bismarck’s pension system, which was introduced in Imperial Germany in 1891. The negative effect on fertility is robust to controlling for the traditional determinants of the first demographic transition as well as to other policy changes.     

Exploring the influence of precipitation on fertility timing in rural Mexico

The influence of environmental conditions on fertility decision-making is becoming increasingly important in the context of contemporary climate change. Deforestation, land availability, and environmental quality may shape decisions regarding family size, particularly in regions with high levels of natural resource dependence. This research examines the relationship between fertility timing and precipitation in rural Mexico by linking household event-history data to municipal-level precipitation measures. Even after controlling for other factors that impact fertility, in historically dry areas, households are more likely to have a child following above average precipitation, using both 1-year and 2-year prior precipitation measures. Conversely, the relationship between precipitation and fertility timing in humid areas of rural Mexico is not statistically significant. Overall, the findings reveal that the fertility-environment connection is highly context-specific and differs across climate zones in Mexico, but that fertility timing is associated with recent rainfall patterns for households in dry areas of rural Mexico.     

The influence of economic conditions on the fertility of peasant women

In this paper, which is based on an enquiry carried out in twenty villages in Southern Poland, the author investigates the fertility of two consecutive generations of peasant women. He shows that the richer the couple are, the more children they have. This is due to the earlier marriage of wealthier peasant girls, who thus begin to bear children sooner, and also bear them more frequently and for a longer period.

This trend was very noticeable in the earlier generation, but shows signs of weakening in the present generation because of the spread of birth control which was first accepted among the richer peasants.

Rich peasant couples not only produce more children, but a greater proportion of their children remain in agriculture. Larger peasant farms are thus sub-divided more quickly than smaller ones, and a low standard of living results.     

Measures of influence of family planning program on fertility]

The question of how to measure the influence of family planning in fertility has been addressed by numerous international scholars. Highlighted briefly here are some of the methods endorsed by United Nations publications and recognized by scholars of various countries: 1) Standardization; 2) John Bongaarts model; 3) Trend analysis; 4) Wishik model; 5) Converse model of Dorothy Nartman; 6) Potter model; 7) Nathan Keyfitz model; 8) "Plural model"; 9) Model analysis.     

Husbands' and wives' relative influence on fertility decisions and outcomes

This research was supported by NICHD Center for Population Research Contract No. HD52807 and Research Scientist Development Award No. AA00002 from NIAAA to the author. The important contributions of Philip Bardsley to this research and to earlier drafts of this paper are gratefully acknowledged. Thanks are also due to Tom Day and Linda Moody Chilingar for their data analytic and statistical skills and to Cathey Heron for her assistance throughout the course of this project.When couples were in conflict about short-term fertility, wives had the same or somewhat greater influence over actual outcomes than did husbands, especially when the wife was the one who did not desire a child. Antecedent wife demographic, attitudinal and couple interactional variables had more influence on short-term fertility decisions made than did antecedent husband variables. However, inclusion of husband data as well as wife data increased discrimination between those deciding to have or not have a child.     

From low to high fertility in Sulawesi (Indonesia) during the colonial period: explaining the 'first fertility transition'

This paper examines the past transition from low to high fertility which, in Indonesia as elsewhere, preceded the return to lower birth rates. Data from two parts of the island of Sulawesi where fertility rose during the colonial period are used to explain both why it rose, and why it was originally low. Economic conditions, it is argued, were the most important factors, affecting fertility via the supply of income and the demand for labour. Two schematic models of the 'first fertility transition' are proposed. In areas with low population densities and area-extensive forms of agriculture responsive to commercial stimuli, birth rates rose as the growth of commerce raised levels of prosperity, facilitated marriage, and undermined institutions such as debt-slavery which had previously acted to restrict marital fertility. In densely populated areas with labour-intensive agriculture and heavy state taxation in labour, fertility rose in response to demands for women's (and possibly child) labour that did not necessarily lead to gains in income.     

Adolescent fertility programs: responding to the needs of today's youth

The 1983 conference on Adolescent Fertility Management in Asia and the Pacific provided a forum for sharing information and experiences. The project was designed to stimulate interest in and strengthen existing programs on adolescent fertility in participating countries, i.e., Bangladesh, Fiji, India, Indonesia, Nepal, Philippines, Sri lanka, and Thailand. Specifically, the conference sought to identify adolescent fertility problems and share experiences in managing adolescent fertility programs, identify gaps in the development and implementation of adolescent fertility programs and projects, and formulate plans to meet the adolescent fertility needs of the participating countries. Capsule presentations of the experiences of the participating countries are presented. Focus is on the projects they have undertaken and proposed activities. In Bangladesh Jatio Tarum Sangha, the national youth organization, seeks to get youth involved in family planning activities through information/education/motivation programs and community development projects. Fiji proposes to establish a youth center to be operated by the Ministry of Health to reduce the incidence of unplanned pregnancy and sexually transmitted diseases in adolescents and to make them more aware of sex-related health problems and the importance of responsible sex. India's Family Planning Association has initiated population education programs for youth. Several projects have been launched in Jakarta to cope with adolescent fertility problems including the adolescent health project, the Consultation Center for Adolescents, and the university-based family health project. The Family Planning Association of Nepal has completed some major programs under its youth project. The Philippines' proposed youth centers are planned to respond to the fertility related needs and problems of Filipino adolescents. Innovations of the center are: the operation of several youth-serving government and private agencies under 1 roof, and encouragement of youth participation in designing and running the center. Sri Lanka does not have much of an adolescent fertility problem. Virtually all fertility is said to occur within marriage. A study on adolescent fertility is planned. Thailand has launched several government and nongovernment programs to reach adolescents both in and out of school. Government programs include counseling services and the National Family Planning Communication for Premarriage adolescents. Key issues are identified and recommendations are made.     

Persistent efforts must continue to be made

Evidence has continuously suggested that population growth in a particular country is closely related to its social stability and economic development. Statistics show that the population growth in the developing countries accounts for 90% of the world's total increase, and the growth rate in those countries is the highest. Therefore, the population problem is of a more serious nature to the developing countries. Unless this problem is solved or at least alleviated, it would be extremely difficult for many developing countries to shed poverty, develop their national economies, and raise standards of living. On the other hand, the trend of growth of the world population and the high rate of population growth in the developing countries will inevitably have grave consequences affecting, directly or indirectly, the economic stability and development of developed countries. These consequences would also affect world peace. The population problem is therefore both a national and an international issue. While each country should take the problem seriously and work hard to tackle it according to its own conditions, all countries in the world should come together to address the problem and make joint efforts for its settlement or alleviation. It is inspiring that the "Day of 5 Billion" has caught global attention and is being observed throughout the world with massive support.     

The influence of human fertility on the economic conditions of the rural population in poland

Summary In 1970, Polish women in agricultural households reported larger numbers of children born alive than women in other occupations. When controlling for the influence of age at marriage and duration of marriage, the average number of children born per women among the farming population increased directly with the amount of privately owned agricultural land. Consistently, women whose principal source of livelihood was derived from non-agricultural sources even though they resided in villages, showed lower fertility than those in the agricultural sector, but significantly higher fertility than city women. This study is based on the five per cent sample of ever-married women between 15 and 70 years of age interviewed about their past reproductive histories in Poland during the 1970 Census of Population.The conclusions identify the high level of human fertility in rural populations as the main determinant of economic status among Polish peasants whose sources of support derive primarily from farming. Additional evidence supporting the hypothesis of dependence of the agricultural economy on the force of human reproduction is based on data for Slovakia and the Czech regions.     

The changing influence of religion on U.S. fertility: Evidence from rhode Island

Traditionally one of the indisputable generalizations in demography has been that Catholics have higher fertility than Protestants and Jews (Freedman, Whelpton, & Campbell 1959; Ryder & Westoff 1971; Westoff, Potter, & Sagi 1964; Whelpton, Campbell, & Patterson 1966). Recently, however, doubts have been raised about the continued validity of this longstanding and heretofore widely accepted generalization.     

Regional paths to fertility transition

New sources of data on national fertility declines are used to examine the nature of fertility transition in major regions. These regions are defined by geographical and cultural criteria as well as by the forces attempting to shape fertility control. Particular attention is devoted to the timing of the onsets of fertility decline in the different countries of each region, and the rapidity of fertility decline within each country. The study finds greater similarities between the transitions than have sometimes been assumed.     

The influence of income on family fertility in the light of the results of empirical studies

Based on data from the 1973-83 Polish Family Budget Survey, this study examines the influence of income as a source of maintenance and income as a determinant of childbearing on family parity. It is assumed that income influences parity as a source of maintenance and as an influence on lifestyle or reproductive behavior. As a source of maintenance, the influence will be positive. As a life-style factor, it could be positive or negative. The hypotheses are 1) that positive influences are characteristics of older couples with a lower educational level and living in villages and small towns and income is a source of maintenance, and 2) a negative influence on parity reflects younger couples with higher educational levels from larger cities and income is a life-style factor. Some examples of how the theory of income influences total fertility are given in addition to a further elaboration of the theory. Other concepts introduced, as related to childbearing, are the value of goods and services with unchanged preferences and an increase in income, with preferences changing with income increases, with income preferences for nonprocreational and for procreational needs, and income as a factor influencing procreational needs and behavior. Correlation analysis is conducted for 33 subpopulations based on duration of marriage, educational level of the household, and size of residence. The results indicate that, in years 1973, 1975, and 1978 when income and parity are significant, the sign is positive. In 1980, there was a decrease in the number of subpopulations with a significant relationship, and in 3 subpopulations the results were negative. The 13 positive subpopulations were similar to those in the 1970s. In 1983, income explained an even smaller amount of parity. The subpopulations with a postive relationship usually have longer marriage durations, which suggest income as a source of maintenance. Negative results were among subpopulations with shorter marriage durations, which suggests life-style factor effects of income.     

Alternative approaches to fertility transition

"Using anomalies of the Italian case as the basis, the aim of this article is to verify how the theoretical framework [of demographic transition] put forward by Lesthaeghe can be interpreted.... While the changes in mores in the Italy of the economic boom were a component of the large-scale processes of secularization, rationalization and modernization specific to the [first demographic transition], the practices, values and models of the collective imagination characterizing the second phase of Lesthaeghe's [second demographic transition] are marked by a state of mind that cannot be put down to the 'spirit of the age' during the years of large-scale modernization, but to the emancipatory and 'rational' falling away of many of the barriers to the unfolding of individual life destiny over and above that based on class, gender and age."     

Evolutionary contributions to the study of human fertility

Demography, lacking an overarching theoretical framework of its own, has drawn on theories in many other social sciences to inform its analyses. The aim of this paper is to bring to the demographic community’s attention research in the evolutionary sciences on fertility, and to demonstrate that evolutionary theory can be another useful tool in the demographer’s toolkit. I first dispel some myths which impede the incorporation of evolutionary theory into demography: I make it clear that evolutionary explanations do not assume that all human behaviour is hardwired and functions to maximize genetic fitness; that they are able to explain variation in human behaviour; and that they are not necessarily alternatives to social science explanations. I then describe the diversity of work on fertility by evolutionary researchers, particularly human evolutionary ecologists and cultural evolutionists, and illustrate the usefulness of the evolutionary approach with examples of its application to age at first birth and the fertility transition.     

The influence of labour force participation and education on fertility in Thailand

Abstract Increasingly, discussion of the appropriateness and effectiveness of methods to limit population growth have focussed both on measures which seek to provide new and efficient contraceptives to an ever larger target population and on those measures which go beyond family planning to emphasize the need for adoption of policies 'expressly related to family roles and opportunities for legitimate alternative satisfactions and activities'.(1) Proponents of the latter course of action argur that such policies offer greater promise of reduction in family size because they directly assault the motivational framework of reproduction. Among the means suggested for limiting reproductioe within marriage as well as postponing marriage is modification of the complementarity of the rolen of men and women.(2) Of particular interest in this regard is the nature of the relation betweens female labour force participation and education and fertility, and the implications these relations may have for future fertility reduction, particularly in the developing world.