The scientific revolution in demography

Since 1960 a debate has taken place between demographers and natural scientists over projections of world population into the future and the methods appropriate for making projections. Underlying this debate is a disagreement over the factors which influence human population growth. To the usual factors of fertility and mortality the natural scientists emphasize the human population's ability to communicate and thereby to enlarge available resources. Also at issue are different philosophies concerning the manipulation of data. The debate between demographers and natural scientists bears many of the features of a scientific revolution as described by Thomas Kuhn. The new theory also meets the criterion of scientific growth contained in the correspondence principle. The theories used by demographers and natural scientists have political implications, since the demographers assume stability whereas the natural scientists observe instability.     

A Cognitive–Social Model of Fertility Intentions

We examine the use and value of fertility intentions against the backdrop of theory and research in the cognitive and social sciences. First, we draw on recent brain and cognition research to contextualize fertility intentions within a broader set of conscious and unconscious mechanisms that contribute to mental function. Next, we integrate this research with social theory. Our conceptualizations suggest that people do not necessarily have fertility intentions; they form them only when prompted by specific situations. Intention formation draws on the current situation and on schemas of childbearing and parenthood learned through previous experience, imbued by affect, and organized by self‐representation. Using this conceptualization, we review apparently discordant knowledge about the value of fertility intentions in predicting fertility. Our analysis extends and deepens existing explanations for the weak predictive validity of fertility intentions at the individual level and provides a social‐cognitive explanation for why intentions predict as well as they do. When focusing on the predictive power of intentions at the aggregate level, our conceptualizations lead us to focus on how social structures frustrate or facilitate intentions and how the structural environment contributes to the formation of reported intentions in the first place. Our analysis suggests that existing measures of fertility intentions are useful but to varying extents and in many cases despite their failure to capture what they seek to measure.     

Instability,investment, disasters,and demography: natural disasters and fertility in Italy (1820–1962) and Japan (1671–1965)

This article examines whether natural disasters affect fertility—a topic little explored but of policy importance given relevance to policies regarding disaster insurance, foreign aid, and the environment. The identification strategy uses historic regional data to exploit natural variation within each of two countries: one European country—Italy (1820–1962), and one Asian country—Japan (1671–1965). The choice of study settings allows consideration of Jones’ (The European miracle, Cambridge University Press, Cambridge, 1981) theory that preindustrial differences in income and population between Asia and Europe resulted from the fertility response to different environmental risk profiles. According to the results, short-run instability, particularly that arising from the natural environment, appears to be associated with a decrease in fertility—thereby suggesting that environmental shocks and economic volatility are associated with a decrease in investment in the population size of future generations. The results also show that, contrary to Jones’ (The European miracle, Cambridge University Press, Cambridge, 1981) theory, differences in fertility between Italy and Japan cannot be explained away by disaster proneness alone. Research on the effects of natural disasters may enable social scientists and environmentalists alike to better predict the potential effects of the increase in natural disasters that may result from global climate change.     

On Net Intergenerational Wealth Flows: An Update

Almost 30 years have passed since I introduced the concept of “net intergenerational wealth flows” in a PDR essay, “Toward a restatement of demographic transition theory.” A great deal of research has been published since then, and accordingly an update is needed. That research suggests the following propositions. Immediately before fertility transition, children's farm labor may not quite offset their consumption, although much depends on how far into adulthood they continue to perform at least some work for their parents. In premodern times children may have paid their way because of lower consumption. Research on the pre‐transitional value of children's work produced contradictory results because it examined both hunter‐gatherer societies, in which both adults and children worked comparatively few hours, and farming societies, in which both worked longer hours. In pre‐transitional societies, the insurance value of children was almost unlimited. For most people in most societies, alternative ways of maintaining savings from the earlier to the later stage of the life cycle first became available only when large‐scale investment in children's education was possible. The costs and gains from that investment played a major role in the onset of the fertility transition.     

Did fertility go up after the oklahoma city bombing? An analysis of births in metropolitan counties in Oklahoma, 1990–1999

Political and sociocultural events (e.g., Brown v. Board of Education in 1954 and the German reunification in 1989) and natural disasters (e.g., Hurricane Hugo in 1989) can affect fertility. In our research, we addressed the question of whether the Oklahoma City bombing in April 1995, a man-made disaster, influenced fertility patterns in Oklahoma. We defined three theoretical orientations--replacement theory, community influence theory, and terror management theory--that motivate a general expectation of birth increases, with different predictions emerging from time and geographic considerations. We used two different empirical methodologies. First, we fitted dummy-variable regression models to monthly birth data from 1990 to 1999 in metropolitan counties. We used birth counts to frame the problem and general fertility rates to address the problem formally. These analyses were organized within two design structures: a control-group interrupted time-series design and a difference-in-differences design. In these analyses, Oklahoma County showed an interpretable, consistent, and significant increase in births. Second, we used graphical smoothing models to display these effects visually. In combination, these methods provide compelling support for a fertility response to the Oklahoma City bombing. Certain parts of each theory helped us organize and understand the pattern of results.     

Explaining fertility transitions

In this essay. I suggest that the crisis in our understanding of fertility transitions is more apparent than real. Although most existing theories of fertility transition have been partially or wholly discredited, this reflects a tendency to assume that all fertility transitions share one or two causes, to ignore mortality decline as a precondition for fertility decline, to assume that pretransitional fertility is wholly governed by social constraints rather than by individual decision-making. and to test ideas on a decadal time scale. I end the essay by suggesting a perceptual. interactive approach to explaining fertility transitions that is closely allied to existing theories but focuses on conditions that lead couples to switch from postnatal to prenatal controls on family size.     

Demographic Theory: A Long View

This essay argues that demographic theory over the last half‐century has substituted short‐term explanations, often focusing on single demographic events, for long‐term theory. This means not only that the explanations cannot be employed to forecast the situation in the more distant future, but they are inadequate even for short‐term analysis. A basis for a longer‐term theory of fertility transition is proposed, employing the concept of social structure and demographic behavior adjusting, slowly and after a considerable lag, to each of three modes of production. The focus is on the transition from agricultural to industrial production, especially as this is occurring in the most advanced industrial societies. Three major conclusions are drawn. (1) Unanticipated fertility changes over the last 50 years can be incorporated within a single demographic transition theory. (2) Societal and demographic changes are still at an early stage of their transition to full adjustment to industrialization. (3) The trend, associated with women's participation in the work force, toward below‐replacement fertility will continue, but at some stage most governments will probably attempt to raise fertility to replacement level even if the effort is extremely expensive and slows economic growth.     

Future population growth: researchers in three countries quantify causes and propose policies

This article discusses Population Council analyses conducted by social scientists from India, Kenya, and the Philippines. These scientists agreed that population momentum would continue to increase population size, and that governments must strengthen and create a range of economic, health, and social programs and policies to slow population growth. Multiple approaches will be needed. John Bongaarts is credited with being the first to identify the key role of population momentum and to decompose growth into unwanted fertility, high desired fertility, and population momentum. Unwanted fertility is responsible for about 19% of projected population growth in India, 26% in Kenya, and 16% in the Philippines. High wanted fertility accounts for 20% of future growth in India, 6% in Kenya, and 19% in the Philippines. Population momentum can account for under 50% or over 90% of growth. Unwanted fertility can be addressed by fulfilling unmet need and increasing knowledge of methods, reducing the fear of side effects and disapproval, and eliminating poor service. Family planning programs need to be strengthened and integrated with maternal and child health services. Preferred and actual family sizes can be reduced by lowering infant mortality by means of increasing infant and child health services and girls' educational attainment. Population momentum can be addressed by delaying age at marriage and childbearing through improving social conditions. Investments in human development through education, training, and income generation can create the conditions for slowing population growth. Countries should decompose population growth into its components of unwanted and high wanted fertility and population momentum as a means of distributing resources most effectively.     

Population and Resources: An Exploration of Reproductive and Environmental Externalities

This article identifies four types of social externalities associated with fertility behavior. Three are shown to be pronatalist in their effects. These three are exemplified by the way theories of economic growth treat fertility and natural resources, the way population growth and economic stress in poor countries are seen by environmental and resource economists, and the way development economists accommodate environmental stress in their analysis of poverty. It is shown that the fourth type of externality, in which children are regarded as an end in themselves, can even provide an invidious link between fertility decisions and the use of the local natural‐resource base among poor rural households in poor countries. The fourth type is used to develop a theory of fertility transitions in the contemporary world; the theory views such transitions as disequilibrium phenomena.     

Nature/nurture: reflections on approaches to the study of homosexuality

There is understandable apprehension by many people towards claims that biology plays a significant role in the etiology of homosexuality. These worries should not be allowed to deter any such work on sexual orientation. It is argued that the only proper way to evaluate biological analyses is against the full background of Darwinian evolutionary theory. Moral issues pertaining to biological research on homosexuality are addressed. Finally, it is urged that both biological and environmental factors be considered in rendering a true picture of homosexuality.     

百万以上少数民族老龄化程度的分层测算

老龄化是当今面临的一大社会问题。通常老龄化的界定主要采用老年人口占比这一指标来量化。以发展的视角与人口年龄结构划分标准而言．单一指标的老龄化论断削弱了学术的严谨性和对现实的指导性。为精确各个族群老龄化的差异,以发展的视角分析出台减缓老龄化进程的相关策略．使区域经济发展与老龄化进程趋向协调．本文基于第四、五、六次人口普查数据资料．对百万以上18个少数民族的老龄化程度进行新的分层测算。在分析其老龄化现状的基础上。给出1990年、2000年、2010年三个时段的年龄结构类型．分层测算了18个民族20年间年龄结构类型或老龄化进程的速度和差异．为国家制定分层策略提供数据化支撑,     

What is natural fertility? The modelling of a concept

The value and importance of the concept of natural fertility have been widely debated since Henry's work in the late 1950s. Whereas Henry regarded natural fertility largely as a useful concept for model building, Coale-Trussell demonstrated that this concept could also be used to analyze patterns of age-specific fertility. The set of age-specific marital fertility schedules assembled by Henry and then used by Coale and Trussell involved largely small populations drawn from disparate sources. Nonetheless, from this diverse and fragmentary data, Henry was able to construct a standard of natural fertility which, in the operational form developed by Coale-Trussell, has proved remarkably general in its application and utility. This in turn suggests that the physiological forces shaping fertility are exceedingly strong, especially the incidence of physiological sterility. There appears to be no single universal pattern of natural fertility. Rather, there is a set of closely related age profiles, the exact shape of which is determined by specific behavioral and social factors that influence childbearing. The increase in physiological sterility with age serves to give an upper limit to fertility at each age, while other factors determine how close a given population comes to that maximum. Although no society has ever demonstrated Henry's ideal notion of a purely physiological fertility pattern, the effect of the intervening factors is often weak. In terms of the Coale-Trussell model, maximum likelihood estimation offers the most informative method of implementation and a time series for 1 population is more readily interpretable than a cross-section comparing several populations.     

中国生育率研究方法:30年回眸

改革开放30年是我国人口学及人口研究迅速成长的30年。生育率研究方法从一个侧面反映出改革开放以来我国人口学研究方法的发展。中国的生育率研究方法既有从西方引进的各种生育率指标和模型,也有中国学者为了适应自己的需要而改进和创建的方法和模型。笔者从生育率度量指标和生育率模型两个方面总结我国生育率研究方法的应用及变化。对在中国生育率研究中所使用的主要方法进行回顾并对这些方法对我国生育率研究的贡献进行总结。     

Fertility decline in the modern world and in the original demographic transition: Testing three theories with cross-national data

This study uses aggregate data on a large number of the world's societies to test three theories of fertility decline in the modern world and in the original demographic transition. One prominent theory relates fertility decline to the changing economic value of children. With industrialization and overall modernization the economic value of children's labor shifts from positive to negative. This interpretation has been challenged by those who claim that the flow of wealth in preindustrial societies is always from parent to child rather than from child to parent. An alternative interpretation is that fertility levels reflect people's efforts to promote their reproductive success, and that this requires the careful tracking of infant and child mortality. Fertility rates are adjusted to the rate of infant and child survival, and will be high when survival rates are low and low when survival rates are high. A third theory emphasizes female empowerment. Fertility will be high when women are highly subordinated to men, but as women gain more autonomy and control over their own lives they reduce their fertility levels because, among other possibilities, higher levels of fertility present them with serious burdens. We tested all three theories through multiple regression analyses performed on two samples of societies, the first a large sample of the world's nation-states during the period between 1960 and 1990, and the second a sample of now-developed societies between 1880 and 1940. Our findings showed that infant mortality was an excellent predictor of fertility, and that female empowerment was a good predictor. However, there was only weak support for the argument that the economic value of children's labor plays an important role in fertility decisions. The findings were discussed in the context of a broader interpretation of fertility behavior in societies with high levels of industrialization and modernization.     

非政策因素对我国生育率影响的量化分析

以西方生育率变动理论为依据,利用中国第五次人口普查的省区截面数据,采用路径分析法对影响中国生育率的非政策因素进行量化分析。目前对生育率直接效应最大的非政策因素是社会经济发展水平,妇女的受教育状况次之,避孕节育对生育率的影响已经减弱;同时还发现社会经济发展水平主要是直接或通过教育因素间接对综合生育率产生影响,而教育对综合生育率的影响除了直接或通过避孕节育间接发生作用外,还有一些影响是通过模型以外的其他要素来发生作用的。     

Social Demography and Eugenics in the Interwar United States

This article explores the relationship between eugenics and demography in the United States in the interwar era. In focusing on the founding of the International Union for the Scientific Investigation of Population Problems and the Population Association of America, it shows how early population scientists contested and negotiated the boundaries of the population field. The article maps the shifting focus away from biological interpretations of population dynamics toward the social, in part as a reaction to the rise of Fascist population research and policy. However, it also shows how social demography was closely intertwined with a “social eugenics” that attempted to ensure human betterment through methods more consistent with New Deal policymaking. This, the article argues, contributed critical intellectual and material resources to the development of social surveys of fertility behavior and contraceptive use, surveys that are more commonly perceived as having undermined eugenics through challenging the biologically deterministic assumptions upon which it was based.     

Disciplining "Sextext": queers, fears, and communication studies

This essay is a critical interrogation of disciplinary responses to Tom Nakayama and Fred Corey's 1997 Text and Performance Quarterly essay, "Sextext." Disciplinary responses to the essay suggest strong resistance to queer theory as a "legitimate" intellectual and critical framework. By reading the responses to "Sextext" through the lens of queer theory, and by offering a political reading of conventional studies of sexual representation, this essay suggests how disciplinary boundaries in Communication Studies are policed to protect the production of "legitimate" scholarship. By revealing these practices, this essay provides further support for the central value of queer theory to the discipline of Communication Studies.     

Natural population decrease in Iowa counties

As a follow-up on the studies by Dorn and Beale, this paper examines differences between Iowa counties with natural decrease and those with natural increase and analyzes the part that migration and fertility played in bringing about an excess of deaths over births in Iowa counties. The county groups are distinctly different in demographic and socioeconomic characteristics. Out-migration as a mode of response adopted by the rural population in Iowa is by far the most dominant factor leading to natural decrease. Sustained net out-migration is more likely to touch off natural decrease in counties of comparatively low fertility than in those with higher fertility. Low fertility is, therefore, a contributing factor to the imbalance between births and deaths, but the amount of influence of fertility adjustment over the fertility differentials among county groups cannot be ascertained in this study because of the correlation between fertility and Catholic Church membership in counties. The data of this study were obtained from the population censuses and vital statistics.     

论我国人口“生育安全”

生育安全问题包括生育的能力安全、生育的过程安全、生育的健康安全和生育的保障安全。生育安全不仅关联着生育的质量,而且关联着生育的权利和健康的权利。在我国,当前环境污染威胁着生育的条件安全和能力安全;自然、社会经济因素中不安全因素威胁生育的主体安全和过程安全;滥用辅助生育技术对生育保障安全构成威胁。生育安全命题具有理论和政策价值。生育安全是人口安全的核心和基础,凸现生育制度的安全追求是新时期的新使命。测度生育安全的指标体系包括正向指标和负向指标。     

Family planning operations research in the Philippines

This essay introduces an issue of the Philippine Population Journal dedicated to the presentation of the results of operations research (OR) studies undertaken for the Philippine Family Planning (FP) Program as part of a program coordinated by the Population Council which seeks to improve FP services. The concept of OR was introduced to program managers and researchers at two workshops held in 1992. Five of the seven diagnostic proposals developed during these workshops were funded and are covered in this Journal. The results of earlier OR studies conducted under the sponsorship of the UN Population Fund are also included. The concept of OR was developed to provide managers with timely answers to their everyday problems through appropriate research. OR forces social scientists to overcome prejudices against this kind of applied research and forces program managers to learn to rely on research findings instead of on hunches. OR also forces both parties to work as a team. An important intent of this Journal is to encourage the dialogue which must precede the institutionalization of OR and to indicate to social scientists and program managers that OR has a personal relevance to their work. The research reported in this Journal will contribute to the building of theories through the many convergences in the conclusions reached about such issues as home visits, suboptimal clinic conditions, inadequate provision of FP information, and the role of outreach workers.