Growth, Inequality and Globalization Theory, History, and Policy by Phillipe Aghion and Jeffery G. Williamson, Cambridge University Press, 1998,207 pp.

Abstract

To what extent is some poverty necessary for economic growth? Does
poverty motivate the poor to work harder, enabling them to both escape their
poverty and in the process increase the total wealth of society? Or does poverty
on balance promote those negative influences such as ill-health and a lack of
proper education that prevent the poor, and hence society, from attaining its
full wealth potential? What effect does a redistribution of wealth from rich to
poor have upon the growth rate? Would the poor manage the extra wealth
thereby gained in a manner more beneficial for society than when the rich managed
it? How does income disparity within an economy wax and wane as
growth takes place, and how does income disparity between economies change
in the face of globalization? Perhaps most important of all, what can political
economists learn from past experiences in informing policy recommendations
for the future?
Such are the questions to which two professors of economics address in
Growth, Inequality and Globalization: Theory, History, and Policy. In the first
of two discussions on the topic, phillipe Aghion from University College
London adopts a largely mathematical approach. In the second discussion,
Jeffery G. Williamson from Harvard undertakes an empirical analysis. These
two approaches compliment one another rather well.
Two ideas are generally handed down to the modem student of economics
on the relationship between growth and wealth inequality. One is based upon
an incentives theory according to which inequality promotes faster growth. The
other derives from the Kuznet's hypothesis which holds that, as an economy
passes through a growth phase, inequality first increases and then decreases
with the onset of maturity. Aghion labels both of these ideas as fallacies, briefly
citing recent evidence which shows widening income inequality in the United
States. His mathematical modeling further shows that, under certain circumstances,
increases in inequality (as measured by the increased dispersion of
investment holdings among members of the society) can lead to lower growth.
This is because the marginal return on investment for the poor is greater than
for the rich. In plain language, poor people can create more wealth with an
additional unit of investment assets than the rich can. Hence, if the rich have
all the assets, society as a whole may not achieve the highest available returns.
In a perfect capital market, the rich could perhaps lend or invest their surplus ...