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Os modelos de crescimento de Adam Smith e Thomas Malthus
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来自 University of California, Irvine 的课程
宏观经济学的力量：真实世界中的经济学原理（葡萄牙语）
185 个评分
从本节课中
Crescimento econômico e Produtividade
与讲师见面
Dr. Peter NavarroProfessor
Paul Merage School of Business
[MUSIC]
Now that we have identified the various factors that determine economic
growth, let's to turn to a discussion of their relative importance.
And here there is much controversy.
While some economists and policy makers stress the need to increase capital
investment, others advocate measures to stimulate
research and development and technological change.
Still a third group emphasizes
the role of a better educated work force.
To better understand this controversy, it is
useful to trace the history of growth theory.
Early economists like Adam Smith and Thomas Malthus
stressed the critical role of land in economic growth.
The Wealth of Nations, published in 1776,
Adam Smith provided a handbook of economic development.
He began with a hypothetical, idyllic age. That original state of things, which
precedes both the appropriation of land and the accumulation of capital stock.
This was a time when land was freely available
to all and before capital accumulation had begun to matter.
What would be the dynamics of economic growth in such a golden age?
Because land
is freely available, people simply spread out onto more acres as
the population increases, just as the settlers did in the American west.
because there is no capital, national
output exactly doubles as population doubles.
What about real wages?
Wages earn the entire national income, because there is
no subtraction for land rent or interest on capital.
Output expands in step with population, so the
real wage per worker is constant over time.
But this golden age cannot continue forever.
Eventually, as population growth continues, all the land will be occupied.
Once the frontier disappears, balanced growth of
land, labor and output is no longer possible.
New laborers
begin to crowd onto already worked soils.
Land becomes scarce and rents rise to ration it among different uses.
Population still grows and so does the national product.
But output must grow more slowly than does population.
Why?
Because of an immutable law known in
economics as the law of diminishing returns.
It's a law discussed much more fully in microeconomics, however
in this context it is an easy law to explain.
Specifically, with new laborers added to a fixed supply of
land each worker now has less land to work with.
This increasing labor to land ratio means that, at
some point, the extra or marginal product of each
additional worker must begin to decrease. And so, too, must the workers real wages
because of this decline in productivity. How bad could get things get?
The Dower Reverend Thomas Malthus thought that population pressures would drive
the economy to a point where workers were at a minimum level of subsistence.
In particular, Malthus reasoned
that whenever wages were above
the subsistence level, population would expand.
While below subsistence wages would lead to high mortality and population decline.
Therefore, Malthus reasoned, only at the level of subsistence
wages could there be a stable equilibrium of population.
And in this world, Malthus believed that the
working classes would be destined to a life that, in the
words of the philosopher Thomas Hobbes, would be nasty, brutish, and short.
In fact it was this gloomy Malthusian picture that lead
to the critical depiction of economics as the dismal science.
These figures contrast the process of economic
growth in Adams Smith's golden age, versus the
Malthusian gloom.
In the left hand figure as population doubles the production possibility
frontier or PPF shifts out by a factor of two in each direction.
Showing that there are no constraints on growth from land or resources.
In contrast, the right-hand figure shows
the pessimistic Malthusian case where a doubling
of population leads to a less than doubling of food and clothing.
Lowering per capita output as more people crowd on a
limited land and diminishing returns drive down output per person.
The ultimate result can be seen in these figures.
In the left-hand figure we see the red line rising
exponentially past both straight line projections for wheat and barley and
oat production into a Malthusian doomsday. The right-hand figure
shows how bushels per capita decline over time due to diminishing returns.
Fortunately, Malthus' dismal forecast was dramatically wide
of the mark because Malthus did not
recognize that technological innovation and capital investment
could overcome the law of diminishing returns.
As a result, land did not become the limiting factor in production.
Instead the industrial revolution brought forth
power driven machinery that increased production.
Factories that gathered teams of workers into giant firms.
Railroads and steamships that linked together the far points of the world.
And iron and steel that made possible stronger machines and faster locomotives.
Moreover, as market economies entered the 20th century, important new
industries grew up around the telephone, the automobile, and electric power.
While capital accumulation and new technologies
became the dominant force effecting economic development.
