Pre-birth Factors Research Articles

Pre- and Post-Birth Components of Intergenerational Persistence in Health and Longevity

We use data on a large sample of Swedish-born adoptees and their biological and adopting parents to decompose the persistence in health inequality across generations into pre-birth and post-birth components. We use three sets of measures for health outcomes in the second generation: mortality, measures based on data on hospitalization and, finally, measures using birth outcomes for the third generation. The results show that all of the persistence in mortality is transmitted solely via pre-birth factors, while the results for the hospitalization measures suggest that at least three quarters of the intergenerational persistence in health is attributable to the biological parents.

Poor Little Rich Kids? The Role of Nature versus Nurture in Wealth and Other Economic Outcomes and Behaviours

Abstract Wealth is highly correlated between parents and their children; however, little is known about the extent to which these relationships are genetic or determined by environmental factors. We use administrative data on the net wealth of a large sample of Swedish adoptees merged with similar information for their biological and adoptive parents. Comparing the relationship between the wealth of adopted and biological parents and that of the adopted child, we find that, even prior to any inheritance, there is a substantial role for environment and a much smaller role for pre-birth factors and we find little evidence that nature/nurture interactions are important. When bequests are taken into account, the role of adoptive parental wealth becomes much stronger. Our findings suggest that wealth transmission is not primarily because children from wealthier families are inherently more talented or more able but that, even in relatively egalitarian Sweden, wealth begets wealth. We further build on the existing literature by providing a more comprehensive view of the role of nature and nurture on intergenerational mobility, looking at a wide range of different outcomes using a common sample and method. We find that environmental influences are relatively more important for wealth-related variables such as savings and investment decisions than for human capital. We conclude by studying consumption as an overall measure of welfare and find that, like wealth, it is more determined by environment than by biology.

Parental Influences on Health and Longevity: Lessons from a Large Sample of Adoptees

To what extent is the length of our lives determined by pre-birth factors? And to what extent is it affected by parental resources during our upbringing that can be influenced by public policy? We study the formation of adult health and mortality using data on about 21,000 adoptees born between 1940 and 1967. The data include detailed information on both biological and adopting parents. We find that the health of the biological parents affects the health of their adopted children. Thus, we confirm that genes and conditions in utero are important intergenerational transmission channels for long-term health. However, we also find strong evidence that the educational attainment of the adopting mother has a significant impact on the health of her adoptive children, suggesting that family environment and resources in the post-birth years have long-term consequences for children’s health.

Why Do Entrepreneurial Parents Have Entrepreneurial Children?

We explore the origins of the intergenerational association in entrepreneurship using Swedish adoption data that allow us to quantify the relative importance of prebirth and postbirth factors. We find that parental entrepreneurship increases the probability of children’s entrepreneurship by about 60%. For adoptees, both biological and adoptive parents make significant contributions to this association. These contributions, however, are quite different in size. Postbirth factors account for twice as much as prebirth factors in our decomposition of the intergenerational association in entrepreneurship. We investigate several candidate explanations for this large postbirth factor and present suggestive evidence in favor of role modeling.

Poor Little Rich Kids? The Determinants of the Intergenerational Transmission of Wealth

Wealth is highly correlated between parents and their children; however, little is known about the extent to which these relationships are genetic or determined by environmental factors. We use administrative data on the net wealth of a large sample of Swedish adoptees merged with similar information for their biological and adoptive parents. Comparing the relationship between the wealth of adopted and biological parents and that of the adopted child, we find that, even prior to any inheritance, there is a substantial role for environment and a much smaller role for pre-birth factors. We also examine the role played by bequests and find that, when they are taken into account, the role of adoptive parental wealth becomes much stronger. We find very little evidence that education or earnings of parents or children are important drivers of the intergenerational wealth relationship between children and their adoptive parents. Our findings suggest that wealth transmission is not primarily because children from wealthier families are inherently more talented or more able but that, even in relatively egalitarian Sweden, wealth begets wealth.

Pre-Birth Factors, Post-Birth Factors, and Voting: Evidence from Swedish Adoption Data

This article analyzes a rich Swedish data set with information on the electoral turnout of a large sample of adoptees, their siblings, their adoptive parents, and their biological parents. We use a simple regression framework to decompose the parent-child resemblance in voting into pre-birth factors, measured by biological parents’ voting, and post-birth factors, measured by adoptive parents’ voting. Adoptees are more likely to vote if their biological parents were voters and if they were assigned to families in which the adoptive parents vote. We find evidence of interactions between the pre- and post-birth factors: the effect of the post-birth environment on turnout is greater amongst adoptees whose biological mothers are nonvoters. We also show that the relationships between parental characteristics, such as education, and child turnout, persist even in the absence of a genetic link between parent and child. The regression-based framework we utilize provides a basis for the integration of behavior-genetic research into mainstream political science.

The origins of intergenerational associations in crime: Lessons from Swedish adoption data

We use Swedish adoption data combined with police register data to study parent–son associations in crime. For adopted sons born in Sweden, we have access to the criminal records of both the adopting and biological parents. This allows us to assess the relative importance of pre-birth factors (genes, prenatal environment and perinatal conditions) and post-birth factors for generating parent–son associations in crime. When considering the extensive margin, we find that pre-birth and post-birth factors are both important determinants of sons' convictions and that mothers and fathers contribute equally through these two channels. At the intensive margin, pre-birth factors still matter, however post-birth factors appear to dominate. In particular, adopting mothers appear to matter most for the probability that sons will be convicted of multiple crimes and/or be sentenced to prison. We find little evidence of interaction effects between biological and adoptive parents' criminal convictions. Having more highly educated adoptive parents, however, does appear to mitigate the impact of biological parents' criminality.

Why Do Entrepreneurial Parents Have Entrepreneurial Children?

Parental entrepreneurship is a strong, probably the strongest, determinant of own entrepreneurship. We explore the origins of this intergenerational association in entrepreneurship. In particular, we identify the separate effects of pre- and post-birth factors (nature and nurture), by using a unique dataset of Swedish adoptees. Its unique characteristic is that it not only includes data on occupational status for the adoptees and their adoptive parents, but also for their biological parents. Moreover, we use comparable data on entrepreneurship for a large, representative sample of the Swedish population. Based on the latter sample, and consistent with previous findings, we show that parental entrepreneurship increases the probability of children's entrepreneurship by about 60%. We further show that for adoptees, both biological and adoptive parents make significant contributions. These effects, however, are quite different in size. The effect of post-birth factors (adoptive parents) is approximately twice as large as the effect of pre-birth factors (biological parents). The sum of these two effects for adopted children is almost identical to the intergenerational transmission of entrepreneurship for own-birth children. We explore several candidate explanations for this important post-birth effect and present suggestive evidence in favor of role modeling.

Why Do Entrepreneurial Parents Have Entrepreneurial Children?

Parental entrepreneurship is a strong, probably the strongest, determinant of own entrepreneurship. We explore the origins of this intergenerational association in entrepreneurship. In particular, we identify the separate effects of pre- and post-birth factors (nature and nurture), by using a unique dataset of Swedish adoptees. Its unique characteristic is that it not only includes data on occupational status for the adoptees and their adoptive parents, but also for their biological parents. Moreover, we use comparable data on entrepreneurship for a large, representative sample of the Swedish population. Based on the latter sample, and consistent with previous findings, we show that parental entrepreneurship increases the probability of children's entrepreneurship by about 60%. We further show that for adoptees, both biological and adoptive parents make significant contributions. These effects, however, are quite different in size. The effect of post-birth factors (adoptive parents) is approximately twice as large as the effect of pre-birth factors (biological parents). The sum of these two effects for adopted children is almost identical to the intergenerational transmission of entrepreneurship for own-birth children. We explore several candidate explanations for this important post-birth effect and present suggestive evidence in favor of role modeling.

The Origins of Intergenerational Associations: Lessons from Swedish Adoption Data*

We use unique Swedish data with information on adopted children's biological and adoptive parents to estimate intergenerational mobility associations in earnings and education. We argue that the impact from biological parents captures broad prebirth factors, including genes and prenatal environment, and the impact from adoptive parents represents broad postbirth factors, such as childhood environment. We find that both pre- and postbirth factors contribute to intergenerational earnings and education transmissions, and that prebirth factors are more important for mother's education and less important for father's income. We also find some evidence for a positive interaction effect between postbirth environment and prebirth factors.

The Origins of Intergenerational Associations: Lessons from Swedish Adoption Data

We use unique Swedish data to estimate intergenerational associations between adoptees and their biological and adoptive parents. We argue that the impact from biological parents captures broad pre-birth factors, including genes and prenatal environment, and the impact from adoptive parents represents broad post-birth factors, such as childhood environment, for the intergenerational association in education and income. We find that both pre- and post-birth factors contribute to intergenerational transmissions, and that pre-birth factors are more important for mother's education and less important for father's income. We also find some evidence for a positive interaction effect between post-birth environment and pre-birth factors.

Prebirth and postbirth influence on the relationship between creative ability and recorded mental illness.

SummaryGroups of 10 high, 20 above average, and 20 low creative ability subjects were constituted by interjudge agreement from among an adult population who were removed from their biological parents and adopted shortly after birth. The adoptees thus received prebirth influence from their biological relatives and postbirth influence from then: adoptive relatives The rates of recorded mental illness were determined among the adoptees, their biological parents and siblings, and their adoptive parents and siblings Mental illness rates in the adoptees were positively and significantly related to their creative ability level, substantiating the hypothesized relationship between creative ability and mental illness. The mental illness rates of the biological parents were positively and significantly related to the creative ability level of the adoptees. Mental illness rates among the adoptive parents and the adoptive and biological siblings were independent of the adoptees’ creative ability level. The data were interpreted as evidence for the influence of prebirth factors on the relationship between creative ability and mental illness No evidence of family‐related postbirth influence was found An evaluation of mental illness rates among uncooperative (nonresponding) potential subjects and their relatives suggested that noncooperation by these adoptees produced a dampening effect on the results of the study.