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    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

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  • DOI:
  • Published online: 01 March 2009

Demographic trends in today's world are dominated by large fertility differentials between nations, with ‘less developed’ nations having higher fertility than the more advanced nations. The present study investigates whether these fertility differences are related primarily to indicators of economic development, the intellectual level of the population, or political modernity in the form of liberal democracy. Results obtained with multiple regression, path models and latent variable models are compared. Both log-transformed GDP and measures of intelligence independently reduce fertility across all methods, whereas the effects of liberal democracy are weak and inconsistent. At present rates of fertility and mortality and in the absence of changes within countries, the average IQ of the young world population would decline by 1.34 points per decade and the average per capita income would decline by 0.79% per year.

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J. C. Abma & G. M. Martinez (2006) Childlessness among older women in the United States: trends and profiles. Journal of Marriage and the Family 68, 10451056.

O. Boonstra (1998) The impact of education on the demographic life course: the family reproduction process of literates and illiterates in the Netherlands at the end of the nineteenth century. History of the Family 3, 303313.

G. Clark & G. Hamilton (2006) Survival of the richest: the Malthusian mechanism in pre-industrial England. Journal of Economic History 66, 707736.

T. C. Daley , S. E. Whaley , M. D. Sigman , M. P. Espinosa & C. Neumann (2003) IQ on the rise. The Flynn effect in rural Kenyan children. Psychological Science 14, 215219.

W. T. Dickens & J. R. Flynn (2001) Heritability estimates versus large environmental effects: the IQ paradox resolved. Psychological Review 108, 346369.

M. Doepke (2004) Accounting for fertility decline during the transition to growth. Journal of Economic Growth 9, 347383.

J. R. Flynn (1984) The mean IQ of Americans: massive gains 1932–1978. Psychological Bulletin 95, 2951.

J. R. Flynn (1987) Massive IQ gains in 14 nations: what IQ tests really measure. Psychological Bulletin 101, 171191.

T. Frejka & C. F. Westoff (2008) Religion, religiousness and fertility in the US and in Europe. European Journal of Population 24, 531.

D. Friedlander , J. Schellekens & E. Ben-Moshe (1991) The transition from high to low marital fertility: cultural or socioeconomic determinants? Economic Development and Cultural Change 39, 331351.

N. G. Jablonski & G. Chaplin (2000) The evolution of human skin coloration. Journal of Human Evolution 39, 57106.

O. Khaleefa , S. B. Abdelwahid , F. Abdulradi & R. Lynn (2008) The increase of intelligence in Sudan 1964–2006. Personality and Individual Differences 45, 412413.

J. Knodel , N. Havanon & A. Pramualratana (1984) Fertility transition in Thailand: a qualitative analysis. Population and Development Review 10, 297328.

J. Kost & J. D. Forrest (1995) Intention status of U.S. births in 1988: differences by mothers’ socioeconomic and demographic characteristics. Family Planning Perspectives 27, 1117.

M. Kreyenfeld (2003) Crisis or adaptation – reconsidered: a comparison of East and West German fertility patterns in the first six years after the ‘Wende’. European Journal of Population 19, 303329.

H. D. Lamson (1935) Differential reproduction in China. Quarterly Review of Biology 10, 308321.

R. D. Lee (1987) Population dynamics of humans and other animals. Demography 24, 443465.

D. R. Leet (1977) Interrelations of population density, urbanization, literacy, and fertility. Explorations in Economic History 14, 388401.

R. Lesthaeghe & K. Neels (2002) From the first to the second demographic transition: an interpretation of the spatial continuity of demographic innovation in France, Belgium and Switzerland. European Journal of Population 18, 325360.

W. Lutz , M. R. Testa & D. J. Penn (2006) Population density is a key factor in declining human fertility. Population and Environment 28, 6981.

R. Lynn & J. Harvey (2008) The decline of the world's IQ. Intelligence 36, 112120.

R. Lynn & M. van Court (2004) New evidence of dysgenic fertility for intelligence in the United States. Intelligence 32, 193201.

R. C. O. Matthews , C. H. Feinstein & J. C. Odling-Smee (1982) British Economic Growth 1856–1973. Stanford University Press, Stanford, CA.

G. R. McPherson & J. F. Weltzin (2008) Implications of peak oil for industrialized societies. Bulletin of Science, Technology and Society 28, 187191.

J. Raven (2000) The Raven's Progressive Matrices: change and stability over culture and time. Cognitive Psychology 41, 148.

R. D. Retherford & W. H. Sewell (1989) How intelligence affects fertility. Intelligence 13, 169185.

H. Rindermann (2008a) Relevance of education and intelligence at the national level for the economic welfare of people. Intelligence 36, 127142.

H. Rindermann (2008b) Relevance of education and intelligence for the political development of nations: democracy, rule of law and political liberty. Intelligence 36, 306322.

J. L. Rodgers & L. Wänström (2007) Identification of a Flynn effect in the NLSY: moving from the center to the boundaries. Intelligence 35, 187196.

X. Sallume & F. W. Notestein (1932) Trends in the size of families completed prior to 1910 in various social classes. American Journal of Sociology 38, 398408.

M. Shayer , D. Ginsburg & R. Coe (2007) Thirty years on – a large anti-Flynn effect? The Piagetian test Volume & Heaviness norms 1975–2003. British Journal of Educational Psychology 77, 2541.

R. R. Soares (2005) Mortality reductions, educational attainment, and fertility choice. American Economic Review 95, 580601.

J. M. Sundet , D. G. Barlaug & T. M. Torjussen (2004) The end of the Flynn effect? A study of secular trends in mean intelligence test scores of Norwegian conscripts during half a century. Intelligence 32, 349362.

T. W. Teasdale & D. R. Owen (2008) Secular declines in cognitive test scores: a reversal of the Flynn effect. Intelligence 36, 121126.

D. I. Templer (2006) Temperature, skin color, per capita income, and IQ: an international perspective. Intelligence 34, 121139.

R. D. Tuddenham (1948) Soldier intelligence in World Wars I and II. American Psychologist 3, 5456.

J. R. Udry (1978) Differential fertility by intelligence: the role of birth planning. Social Biology 25, 1014.

F. van de Walle (1980) Education and the demographic transition in Switzerland. Population and Development Review 6, 463472.

D. R. Vining (1995) On the possibility of the reemergence of a dysgenic trend with respect to intelligence in American fertility differentials: an update. Personality and Individual Differences 19, 259263.

M. A. Vinovskis (1976) Socio-economic determinants of interstate fertility differentials in the United States in 1850 and 1860. Journal of Interdisciplinary History 6, 375396.

E. Weede (2004) Does human capital strongly affect economic growth rates? Yes, but only if assessed properly. Comparative Sociology 3, 115134.

E. Weede & S. Kämpf (2002) The impact of intelligence and institutional improvements on economic growth. Kyklos 55, 361379.

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