an essay on the effects of income inequality on...
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Title An Essay on the Effects of Income Inequality on EconomicGrowth
Author(s) FUJISAWA, Nobuhiro
Citation 沖縄大学法経学部紀要 = Okinawa University JOURNALOF LAW & ECONOMICS(13): 1-12
Issue Date 2009-11-30
URL http://hdl.handle.net/20.500.12001/5997
Rights 沖縄大学法経学部
[Articles]
An Essay on the Effects of Income Inequality on Economic Growth
Department ofLawand Economics, Okinawa University, Kokuba 555, Naha, Okinawa 902-8521, Japan
Nobuhiro FUJISAWAr
Abstract
Income inequality has been a hot topic in economic circles for many years. Some
authors have viewed the issue from how income inequality affects the economy, while
others have looked at how the economy might influence unequal distribution of resources,
such as income. Income inequality has also been shown to have unequal benefits in
different stages of development. Income inequality influences politics in a big way as well.
The term "income gap" that many are familiar with has much to do with a country's
economic growth, with some of the determinants being poverty, the accumulation of
human capital, redistribution, social conflict, economic mobility and trade liberalization.
This short paper will look at income inequality in all these areas and suggest future
research on the relationship of income distribution and economic growth.
Keywords: Income Inequality, Economic Growth, Preferential Trade Agreements
JEL classification: F15; 011; 015; 040
t E-mail: [email protected]; tel.: +81-98-832-2988; fax: +81-98-832-2988.
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An Essay on the Effects of Income Inequality on Economic Growth
1. Introduction
Since Kuznets (1955) showed the relationship between economic growth and income
inequality, many studies have explored the influences of economic growth on income
distribution. The Kuznets curve - whereby inequality first increases and later decreases
during the process of economic development - emerges as a clear empirical regularity. This
implies that once a country develops enough, problems caused by income inequality could
vanish. However, this doesn't mean that countries around the world eventually pass
through the same process of development. In fact, incomes per capita in countries around
the world are diversified, and have no tendency toward convergence. As Pen (1973)
indicated, inequality among countries is imaged as a "parade of dwarfs and a few giants."
One reason why we should pay attention to income inequality is its relationship to
poverty. For any given average level of income, if income is not distributed relatively
evenly, there will be a group of people who feel poor. In many instances, poverty can be an
outcome of perception from making comparisons. If a large enough percentage of the
population perceives themselves as poor, and the government has relatively weak controls
in place, widespread unrest can be an outcome. For this reason, poverty can be a serious
problem that a government must tackle one way or another. In addition to social unrest,
overall economic growth can be affected by unequal income distribution.
In the 1990's, Galor and Zeira (1993) and Banerjee and Newman (1993) looked at the
cause and effect relationship from the opposite view with their research into how income
inequality influences economic growth. They argued that income distribution plays an
important role in the determination of aggregate economic activity and economic growth.
They showed that when credit constraints are present, reducing wealth inequality can
actually have a stimulating effect on growth. Pioneered by them, many studies on the
effect of income inequality on economic growth have been explored.
For instance, Fishman and Simhon (2002) presented a model that links the division of
labor and economic growth with the division of wealth in society. They showed that
income equality increases investment in specialization and leads to a division of labor and
high long-run development. Nakajima and Nakamura (2008) constructed a model that links
income with the price of education. They showed that the educational expenditures of the
rich could prevent the poor from escaping poverty, thus causing persistent inequality.
2. Overview 1
There are a number of channels through which income inequality affects economic
growth. This paper shows what determines the possibility that a high level of inequality is
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good for growth at some stages of development and bad for growth at others.
Section 3 reviews the relationship between poverty and economic growth. It shows
that economic growth in a country as a whole is effective in escaping from poverty. Section
4 explains the effects of income inequality on the accumulation of human capital. It is noted
that human capital is one of the key factors of economic growth in recent new growth
theories and that it is affected by income inequality in a different way than that of physical
capital. Section 5 reviews how income inequality affects efficiency in the economy through
income redistributions through taxes. Section 6 reviews social conflict in respOnse to
income inequality. It indicates how lower wealth can lead to lower growth and even to
stagnation when the incentives to domestic accumulation are weakened by redistributive
considerations. Section 7 reviews economic mobility as the means of change for income
inequality. Section 8 reviews how trade liberalization affects income inequality. Section 9
discusses the direction of future research.
3. Is growth good for the poor?
One reason economists care about income inequality is because it relates to pOverty.
Holding constant the average level of income per capita in a country, a higher degree of
income inequality will mean that poor people are worse off. This observation implies that if
there is a Kuznets curve - for pOor countries, an increase in income per capita also means
an increase in inequality - then it is theoretically possible that economic growth can be bad
for the poorest people in a country. Specifically, the effect of growth raising the average
level of income may be counteracted by a widening of inequality as the poorest people fall
further below the average. Whether this theoretical possibility corresponds to reality
whether growth may be bad for the pOor - is an empirical Question.
The most important determinant for the incomes of the pOor is a country's average
level of GDP per capita. Dollar and Kraay (2002) showed that average incomes of the
poorest Quintile rose proportionately with average incomes in a sample of 92 countries
spanning the last four decades. This effect was due to pOlicy that targeted over all GDP
growth, and not specifically the pOorer population. This is because the share of income of
the poorest Quintile does not vary systematically with average income. It also does not vary
with many of the policies and institutions that explain growth rates of average incomes, nor
does it vary with measures of policies intended to benefit the poorest in society. This
evidence emphasizes the impOrtance of overall economic growth for pOverty reduction.
The approach of the paper is based on Wei! (2008) and Benabou (1996).
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An Essay on the Effects of Income Inequality on Economic Growth
Deininger and Squire (1996) also found a strong positive relationship between growth and
reduction of poverty based on a new data set on inequality in the distribution of income.
Summarizing the results of these studies, growth - as measured by GDP per capita
is almost always good for the poor, and so are the policies that lead to this growth.
4. Effects of income inequality on the accumulation of human capital
Income inequality is related to the saving rate for the simple reason that saving rates
tend to rise with income. That is, the higher a person's income is. the higher her saving's
rate is likely to be. The total amount of savings in a country is the sum of savings by people
in all different income groups. The more unequal income is - the higher the fraction of total
income earned by the richer people - the higher total savings will be. which leads to the
accumulation of physical capital.
Although a more unequal distribution of income is beneficial for accumulating physical
capital, the situation is the opposite in the case of human capital accumulation. Unlike the
case for physical capital. the opportunities that anyone person has to invest in human
capital are limited to the human capital that he can invest in himself, such as training and
education.
Galor and Zeira (1993) assumed that at lower levels of investment, the marginal
product of human capital was very high. But as the Quantity of human capital that is
invested in anyone person increases, its marginal product goes down. By contrast, the
marginal product of physical capital that anyone investor faces does not depend on the
amount that that person invests in physical capital. because any single person's investment
is minuscule in relation to the national level of capital. If a person has only a little money, he
will invest in human capital rather than in physical capital because it is always better to
invest in the form of capital with the highest marginal product. But people with a lot of
money to invest will invest their marginal money in physical capital.
In this circumstance, if income is redistributed from the rich person to the poor person,
two things tend to happen. First, human capital accumulation will rise. because the poor
person will invest her extra money in human capital, while the rich person will reduce her
investment in physical capital. Second. total output will go uP. because the marginal product
of human capital being invested in by the poor person is higher than the marginal product
of physical capital that the rich person invests in.
The different effects of income inequality on physical and human capital accumulation
- beneficial in the case of physical capital and harmful in the case of human capital
suggest that inequality may have different effects on the pace of economic growth at
different stages of growth. Galor and Moav (2004) indicated that in early stages of
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industrialization. since physical capital accumulation is a prime source of economic growth.
inequality enhances the process of development by channeling resources towards the
owners of capital whose marginal propensity to save is higher. In later stages of
development, however, as the return to human capital increases due to capital-skill
complementarity. human capital becomes the prime engine of economic growth. This
implies that inequality could be detrimental to growth in developed countries. In other
words, this process is evident when looking at stages of development in countries where
industrial economies have moved up to service economies.
5. Income inequality and efficiency
The way in which income inequality can affect the efficiency of production is through
the channel of income redistribution. When incomes are unequal. governments face
pressure to redistribute income through taxation, which can indirectly lower the level of
efficiency. and thus output.
Based on Alesina and Rodrik (994) and Persson and Tabellini (994), let us assume
that income redistribution is the only thing the government does. Assume also that
redistribution takes the following form. First. the government taxes all workers at the same
rate. Second, the government takes the revenue that it collects from this tax and pays it
back to workers in equal amounts (known as a lump-sum transfer). A worker's pretax
income is the income that he earns before any taxes are collected. A worker's disposable
income is his pretax income minus the taxes that he pays and plus the transfer that he
receives from the government.
We can now examine the amount of redistribution different workers would prefer.
Consider first a worker with pretax income above the mean level in the country. This
worker will be worse off by redistribution for two reasons. First, he will receive less back in
the form of a lump-sum transfer than he paid in taxes. Second, the reduction in economic
efficiency resulting from redistributive taxation will also lower the worker's pretax income.
Thus, a worker with pretax income above the mean will favor a tax rate of zero. In the case
of a worker with pretax income exactly equal to the mean, only one of the two effects
described above is operative. That is, the negative effect of redistributive taxes on
efficiency, and thus on pretax income. makes him worse off. Therefore, this worker will
also be against redistribution.
For a worker who earns less than the mean pretax income, the two effects of the tax
work in opposite directions. The lump-sum payment he will receive from the government
will be larger than his taxes. so his disposable income rises. However, the inefficiency
resulting from high taxes lowers his pretax income, making him worse off. though not as
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An Essay on the Effects of Income Inequality on Economic Growth
badly off as the previous two workers. Thus, a worker with income below the mean faces
a trade-off between the benefits that he gets from redistribution and the costs of
inefficiency due to taxation. The farther below the mean his pretax income, the more
important to him redistribution is, and thus the less harmful reduced pretax income
becomes, and the higher the level of taxation he will prefer.
As a result, all workers with pretax income greater than or equal to the mean will want
a tax rate of zero. Workers with pretax income below the mean will want a positive tax rate.
This desired tax rate will be higher for workers with lower pretax income. So how are
actual rates of taxation determined? The answer is that the determination of tax rates is a
political process. According to median voter theorem, the tax rate chosen will be the one
preferred by the person with the median level of pretax income. Notice that the median
level of pretax income is always (at least in all of the countries for which we have data)
below the mean level of pretax income. Thus, the tax rate selected by the median voter will
be above zero.
Finally, analyzing the effect of income distribution on the level of taxes, and thus the
effect on efficiency, we see that the wider the distribution of income, the farther the median
level of pretax income will be below the mean. When median pretax income falls, the rate of
taxation favored by the median voter rises. Therefore, higher inequality leads to more
redistribution and more taxation, and a lower level of efficiency. Through this channel,
income inequality lowers the average level of income.
6. Social conflict in response to income inequality
The pressure for redistribution is expressed in several ways, all of which affect growth
negatively. One expression is through political instability as different groups compete for
pOwer. Tornell and Velasco (1992), Tornell (1993), and Benhabib and Rustichini (1996)
studied how growth is affected by distributional conflict between long-lasting interest
groups or coalitions by using "dynamic commons problem" games. Through these games,
Benhabib and Rustichini (1996) showed how lower wealth can lead to lower growth and
even to stagnation when the incentives for domestic wealth accumulation are weakened by
redistributive considerations.
Therefore, unstable political situations discourage investment, as occurs when, for
example, people who build factories worry that their property might be confiscated
following some potential future revolution or other change in government.
A second expression of pressure for redistribution is crime. Property crime is often the
attempt by poor people to redistribute resources through channels other than political
systems. Grossman and Kim (1996) incorporated the economic theory of predation into the
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theory of economic growth. They focused on the allocation of resources between the
predator dynasty and the prey dynasty. Generations of the prey dynasty that chose to
deter predation. even though their property was perfectly secure, accumulated productive
capital more slowly than the preceding generations that tolerated predation. Even if
deterrence seems to be a better choice for the prey dynasty. deterrence can be costly.
7. Economic mobility
Economic mobility. which means the movement of people from one part of the income
distribution slide rule to another. especially intergenerational mobility. can explain
intertemporal income inequality. According to Corak and Heisz (1999). a Canadian man
whose father was in the lowest income Quartile has a 17% chance of ending up in the
highest income Quartile. and the son of a man who was in the highest Quartile has a 20%
chance of ending up in the lowest Quartile. About 33 percent of those born to fathers in the
bottom Quartile were also in the bottom as adults. and about 35 percent of sons born to
fathers in the top Quartile also had earnings in the top Quartile. In contrast, those in the
middle of the income distribution spectrum are characterized by close to perfect mobility.
Unfortunately. detailed data on mobility are not available for many countries. so it is not
possible to determine how mobility is related to a country's level of income per capita or its
rate of economic growth.
As to the determinants of mobility. Weil (2008) indicated that the most important
influence can be access to education. Education opens a path to upward movement in the
income distribution scale for children of the poor. In countries with generous public
education systems. such transitions are more likely. He also points out the importance of
public health policies and broad access to medical care.
The literature on the relationship between income distribution and economic
development, which follows the capital market imperfection approach. shows that income
inequality affects long-run economic performance provided that the production technology
of human capital or final output is non-convex.
Moav (2002) demonstrated that the non-convexity of technology can be replaced by an
assumption that savings, which is bequeathed to the next generation. is a convex function
of income. He developed a small. open overlapping-generations economy model in which
the evolution of income within each dynasty in society is governed by a dynamical system
that generates a poverty-trap equilibrium along with a high-income equilibrium. In the
model, the utility function is designed to generate the convex bequest function.
By constructing a simple model that includes the price of education. Nakajima and
Nakamura (2009) showed that the educational expenditure of rich households could
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An Essay on the Effects of Income Inequality on Economic Growth
prevent poor households from escaping poverty. Their framework mainly follows that of
Moav (2002).
Their idea is that the rich household's demand for higher education pushes up the price
of education at a pace faster than the poor household can keep up with. Accordingly, the
poor are gradually excluded from higher education, and consequently income inequality
between the rich and the poor expands in the long run. They indicated that this mechanism
could be an explanation for the rise in income inequality.
8. Trade liberalization and income inequality
In order to argue the relationship between trade liberalization and income inequality,
income heterogeneity within a country must be introduced Fajgelbaum et al. (2009)
constructed a model to study the pattern of trade between countries that differ in size and
income distribution but are otherwise identical. They were able to show that, in many
circumstances, trade liberalization especially benefits the poorer households in wealthy
countries and the richer households in poor countries. They provide a demand-based
explanation for the pattern of trade in goods of different Quality. Those non-homotheticities
in demand forge a link between the shape of a country's income inequality and the pattern
of trade.
Dalgin et al. (2008) and Choi et al. (2009) also showed that such links between income
inequality and trade patterns are important in the real world. Dalgin et al. (2008) pursued an
empirical investigation on the effect of inequality on trade with the use of a gravity model.
Choi et al. (2009) investigated how the distribution of income shapes patterns of
consumption and how international trade in Quality differentiated varieties within narrow
product categories. They showed that country pairs that share more similar income
distributions also exhibit a more similar distribution of import prices.
The recent proliferation of preferential trade agreements (PTAs) sheds light on the
effects of income inequality not only on international economies but also on domestic
economies. For instance, Dollar and Kraay (2004) examined the effects of globalization on
the poor. They identified a group of globalizing developing countries and found that those
countries grew at 5.0% per capita. In contrast, rich countries had a per capita growth rate of
2.2% and non-globalizing developing countries saw only a 1.4% rise. This implies that the
globalizing developing countries are catching up with rich countries while the non
globalizing developing countries are falling further behind.
For the past decade, many studies confirm that PTAs could stimulate economic growth
and flows of international investment, which in turn could lead to welfare improvement for
each county involved in the formation of PTAs. Ariyasajjakorn et al. (2009) examined the
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impact of Free Trade Agreements (FTAs) on income distribution within the Association of
Southeast Asian Nations (ASEAN) and between the members and their trading partners
outside ASEAN. By using a Computable General Equilibrium model, they showed that the
FTAs tend to widen the income gap between capital owners and labor in each ASEAN
member. On the other hand, the income gap between skilled and unskilled labor seems to
decline in each ASEAN member since the unskilled wage improves more than the skilled
wage.
9. Concluding remarks
This paper presented a survey on the effects of income inequality on economic growth
along with various determinants relevant to these effects. Some of these determinants are
poverty, the accumulation of human capital, redistribution, social conflict, economic
mobility, and trade liberalization. The direction of future research that I will perform is
discussed below, especially in relation to PTAs.
As described in section 8, there are a number of studies which confirm that PTAs could
stimulate economic growth. In the future, I plan to investigate the relationships between
heterogeneous income distributions among countries involved in preferential trade
agreements (PTAs) and actual economic growth. Since Kuznets (1955) showed the
relationship between economic growth and income distribution, many studies have
explored the influences of economic growth on income distribution. Several decades later,
Galor and Zeira (1993) looked at the cause and effect relationship from the opposite
perspective with their research into how income distribution influences economic growth.
Also, as Matsuyama (2000) showed, inherently identical countries can be divided into
rich countries and poor countries by forming PTAs, which he called "symmetry-breaking."
Thus PTAs may have some mechanisms that cause inevitable inequalities. In addition, as
Grossman and Helpman (1995) indicated, domestic political environments constrain the
actions that governments can take internationally. Dollar and Kraay (2003) indicated that
not only trade but also domestic institutions have an important role in economic growth.
Helpman (2008) suggested that institutions are more fundamental determinants of
economic prosperity than capital accumulation or R&D investment on the grounds that
they - institutions - frame the environment in which these activities take place and that
institutions are difficult to change. Incorporating those studies to explore how the economic
growth of each country within PTAs is influenced by heterogeneous income distributions
might be crucial to understanding the effects on each country that the recent proliferation
of PTAs may have.
Inequality within a country is correlated to the stage in development of that country,
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An Essay on the Effects of Income Inequality on Economic Growth
which means that income distribution in the country can affect economic growth. The
differences in income per capita around the world are enormous, due in part to
globalization. This situation is sometimes referred to as "a parade of dwarfs and a few
giants." Determining whether income inequality within the country can facilitate or detract
from economic growth reinforced by PTAs is a key issue of future research. In addition, I
propose expanding this research to show how the impact of varying income distributions in
countries involved in PTAs ultimately influences the world economy.
Moreover, different variables should be introduced into the equations to investigate
their influences on economic outcomes. The variables are interest groups, the structure of
industries, political stability. and institutions. These variables were derived from research
by Grossman and Helpman (1995) discussing determinants of the success and failure of
PTAs. By introducing these variables. my project will show why PTAs are characterized
by the diversity of institutions. For instance, the reason why the EU has such a different
institutional structure from that of NAFTA, which in turn differs so much from the
organization for APEC should be studied. My future ambitions are to show whether the
recent proliferation of PTAs serves as "building blocks" or "stumbling blocks" for
multilateral trade liberalization.
The recent proliferation of PTAs involves the whole world, including the United States,
Japan, and many other countries. With PTAs proliferating, one PTA may have a worldwide
crisscrossing of preferences with different rules of origin and different tariff rates on
identical products depending on where a product originates. As a result, the trading system
may become chaotic, much like a "spaghetti bowl" as coined by Bhagwati (1995,2008). My
interest is in the influences that the formation of PTAs among heterogeneous countries has
on economic growth, especially in consideration of income inequality. Of interest is also
exploring how heterogeneous countries affect each other by forming PTAs. For instance. in
the Pacific Rim, there are many countries which differ in income distribution, political
stability, economic fundamentals, and stages of development. Reducing the chaos of the
"spaghetti bowl" through harmonization may help bring about political and economic
stability in the Pacific Rim.
Acknowledgements
I appreciate the comments that Kenneth T. Howells gave and his editing help with my
paper.
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