This paper reports on work aimed at extending stable population theory to include immigration. its central findings is that, as long as fertility is below replacement, a constant number and age distribution of immigrants (with fixed fertility and mortality schedules) lead to a stationary population. Neither the level of the net reproduction rate nor the size of the annual immigration affects th...

Background China has experienced an obvious fertility drop since the 1990s. Researches showed that social-economic growth played a more significant role than birth control policy in the process (Chen, 2005; Li, 2004). Analysis by Cai (2008) found that economic indicators are significantly related to total fertility rates in counties of Jiangsu and Zhejiang. However, there is a lack of analysis ...

The level of fertility in Igbo, eastern Nigeria, was examined using demographic estimation techniques. A survey was conducted among 1000 women in the communities of Owerri, Orlu, and Awo-Idemili. Data for the analysis were taken from the study of lactation and birth spacing dynamics. The analysis showed that the completed family size in the Igbo area is 6.1. Results of various techniqu...

This study examines the influence of financial intermediation on fertility rate and labor allocation decisions. A panel Vector Autoregression model using three variables of interest, specifically, financial intermediation, fertility, and industrial employment data in 87 countries, was estimated. This convenient methodology allows the relationship between the variables to change over time. Fi...

The present study investigated whether associations between individuals’ personality traits and whether they have children have been modified by birth-cohort effects in the 20th-century United States. Participants were from the Midlife Development in the United States study (n = 6,259) and the Wisconsin Longitudinal Study (n = 3,994) and were born between 1914 and 1974. Data on personality trai...

Studies were conducted to assess (a) the pH and motility of semen removed from the ductus (d.) deferens and receptaculum from males sexually rested 1 wk, (b) the pH, motility, and sperm concentration of semen after each successive ejaculation (ejaculated 3 or 5 times at 30-60 min intervals) and (c) the rate of semen replenishment and the fertility of the replenished semen after emptying the d. ...

In this paper, we use data from the US census to document the history of the relationship between fertility choice and key economic indicators at the individual level for women born between 1826 and 1960. We find that this data suggests several new facts that should be useful for researchers trying to model fertility. (1) The reduction in fertility known as the Demographic Transition (or the Fe...

ƒ Typically, fertility has a pro-cyclical relationship with economic growth. Recessions often lead to a temporary decline in period fertility levels one or two years later, partly reflecting a postponement of childbearing that is often later compensated during the period of improved economic conditions. ƒ Theories suggesting a counter-cyclical relationship between economic trends and fertility ...