Systems theory and human population growth

More children in a family are also regarded as an insurance against old age by the parents. Many of the ancient philosophers like Confucius ChinaKautilya IndiaIbn Khaldin ArabPlato Greece and modem thinkers like Adam Smith, David Richard and others, eidier directly or indirectly, have said somewhat significant on population issues.

In the present-day world, as would be true of any point in time, different countries of the world are at different stages of the demographic transition.

Human Population Growth and extinction

This integration increases motivation, improves access, and raises the effectiveness of investments in family planning. When the population of a species grows beyond the capacity of its environment to sustain it, it reduces that capacity below the original level, ensuring an eventual population crash.

But he could not visualize that human beings would invent contraceptives and other family planning devices for birth control. A lower level of optimum population may be justified from the economic viewpoint, but such a level may be harmful keeping into view the defence considerations of the country.

Malthus was also severely criticized for ignoring the role of changing technology and the consequent transformation in socio-economic set-up of a society. Before this stage begins, there can be one more stage in which low birth and death rates lead to slow population growth.

In the first stage, the birth rate and the death rate are high and the growth rate of population is low. Even as early as the middle ages, farmers in the East and what would become South America realized the need for crop rotation to prevent soil erosion.

This dates back to prehistoric times, when agricultural methods were first developed, and continues to the present day, with fertilizers, agrochemicals, large-scale mechanization, genetic manipulation, and other technologies.

Theories of Population: Malthus Theory, Marx’s Theory and Theory of Demographic Transition

It changes with a change in any of the factors assumed to be given. Given these assumptions, the optimum population is that ideal size of population which provides the maximum income per head.

This has been particularly so in underdeveloped countries like India where the Malthusian theory is said operate. It postulates a little and slows population growth. In fact, the people of Europe were made wiser by Malthus who forewarned them of the evils of over-population and they started adopting measurers toward it off.

While fiscal policy aims at increasing or stabilising the level of employment, output and income in a country, no reference is made to the optimum level of population. Explain how principles of system theory apply to the Earth as a living system. Criticisms of the Malthusian Doctrine: The transition from high birth and death rates to low rates can be divided into three stages some scholars like Haggett, have divided into four or five stages: It puts pressure on food prices that makes it more difficult for the poor to buy the food they need.

Should a tax penalty be imposed for each child after a fixed number of children, considering that the tax system has not solved the population migration problem? In this stage, the fertility rate declines and tends to equal the death rate so that the growth rate of population declines. In the last stage, the birth rate starts falling and tends to equal the death rate.

Yet none would deny that starvation is a very real fact even in Population is necessarily limited by the means of subsistence. Barundi, Ethiopia, Chad, Eritrea and Timor have been categorized as the five hungriest countries in the world.

Population growth

Unlike the Malthusian theory, the optimum theory does not establish relationship between population growth and food supply. Thus Malthus has proved to be a false prophet. The advanced countries of the world are passing through this last stage and the population is increasing at a slow pace in them.Human Population Growth The two types of population growth of any species are exponential growth and logistic population growth (Simon, Reece and Dickey, ).

Unit 5: Human Population Dynamics mint-body.com This phased reduction in death and birth rates is a process called the demographic transition, which alters population growth rates in several stages (Fig. 3).

Top 3 Theories of Population (With Diagram)

Malthusian Theory of Population Growth Thomas Robert Malthus - Malthus was a cleric and scholar from England who lived from Malthusian Theory of Population Growth - This theory states that population grows exponentially, thus out-growing a society's resources.

Human overpopulation (or population overshoot) The fact that some affluent countries demonstrate negative population growth fails to discredit the theory as whole, or have created large dam and dike systems, like the Netherlands.

Low birth and death rates with slow population growth. iv. Stage III: Birth and death rates both decline appreciably leading to zero population growth. The theory holds that pre-industrial societies were characterized by stable populations which had both a high death rate and birth rate. It postulates a little and slows population growth.

Population growth can be defined as an increase or decrease in the population size of living species including human beings. Human populations are also subject to natural process of birth and death. There has been a rapid increase in the worlds human population over the last few decades (UNFPA, ).

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Systems theory and human population growth
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