Abstract
This chapter examines the effect of population aging on development paths of an economy by distinguishing between human capital obtained through schooling before entering the labor force and the stock of common knowledge of contemporary workers about productivity improvements. Each individual determines his own human capital investment, i.e., schooling period, financing by borrowing. Therefore, spending on human capital formation reduces lifecycle savings and hence physical capital formation.
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Notes
- 1.
- 2.
In the previous chapters, the first childhood period is not taken into account explicitly and children are assumed to be fed by their parents.
- 3.
Such an overlapping generations model has been introduced by, for example, de la Croix and Michel (2002; Sec. 5.2.3) and Yakita (2004), all of whom assume the intergenerational externalities in human capital production. For discussions against the formulation of human capital accumulation of the Lucas (1988) type, see, for example, de la Croix and Licandro (1999).
- 4.
Lee and Barro (2001), after taking into account schooling quality, concluded that more school resources enhance school outcomes. The causality from education spending to economic growth seems still controversial.
- 5.
De la Croix and Licandro (1999) suggested similar effects on schooling and the balanced growth rate. However, they did not take into account physical capital accumulation.
- 6.
Unlike de la Croix and Michel (2002), the length of retirement in our model does not affect the aggregate human capital of the economy. For simplicity, we assume that the retirement age is given institutionally. Many countries have such institutional arrangements. See, for example, Bloom et al. (2003).
- 7.
When the depreciation rate is about 10 % per year, capital is mostly depreciated over the production course of a 25-year generation.
- 8.
- 9.
- 10.
- 11.
Using CRRA utility will lead to qualitatively similar results.
- 12.
We distinguish labor supplied by an individual, h t , from effective labor in production, A t h t , while the individual with human capital, h t , supplies one unit of time.
- 13.
If intergenerational transmission of human capital is allowed for, this result may not necessarily hold. The so-called knife-edge condition has to hold.
- 14.
If there is a scale effect due to human capital accumulation in output production, an increase in η may raise the equilibrium growth rate. See Appendix 1.1.
- 15.
See Appendix 1.2.
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Appendix 1
Appendix 1
1.1 1.1 Scale Effect
If we assume \( {A}_t={K}_t/ a \) in output production, there will be a kind of scale effect due to human capital accumulation through schooling. Specifying the production function as \( {Y}_t={K}_t^{\alpha}{\left({A}_t{L}_t\right)}^{1-\alpha} \) for exposition, the aggregate production function can be written as \( {Y}_t={\left({h}_t/ a\right)}^{1-\alpha}{K}_t \). Then we have
corresponding to (9.14) in the text. If the right-hand side is greater than one, the growth rate of the capital-labor ratio is increasing in time and so is the per capita output growth rate
Therefore, as can be seen from the above, the equilibrium-growth rate is not necessarily decreasing in η. In this case, the rate of change in educational expenditure is smaller than the equilibrium growth rate, i.e., \( 1+{\widehat{\gamma}}_e={\left(1+\widehat{\gamma}\right)}^{1/\left[1+\left(1-\alpha \right)\eta \right]}<1+\widehat{\gamma} \).
1.2 1.2 Education in the Family and Paid by Parents
Yakita (2010) considered both education in the family and in school. If both of them are available to parents, the human capital of an individual working in period \( t+1 \) with intergenerational transmission of human capital of parental generation can be produced as follows:
where h t is the stock of human capital of an individual of the working generation in period t (which we call generation t), e t is per child educational expenditure by his parent, and \( {\overline{h}}_t \) is the average stock of human capital of generation t. In this case parents will choose \( {e}_t=0 \) when the wage rate is sufficiently low. Assuming the neoclassical constant-returns-to-scale production function, \( {Y}_t={K}_t^{\alpha}{L}_t^{1-\alpha} \), we can show that there is a critical wage rate separating dynamics of the system into two phases. In this case the economy is likely to fall into the development trap, other things being equal, if the parameters are such that human capital investment tends to be discouraged, i.e., \( e\approx 0 \), that is, if (i) per child rearing time is less, (ii) the utility weight on human capital per child is smaller, (iii) the savings rate is greater, (iv) the scale parameter in human capital production is greater, and/or (v) the educational effect of the parent on children is greater.
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Yakita, A. (2017). Longevity, Education and Economic Growth. In: Population Aging, Fertility and Social Security. Population Economics. Springer, Cham. https://doi.org/10.1007/978-3-319-47644-5_9
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