Population | 人口 | Population refers to the total number of inhabitants(居住者) of a particular country. Economists are interested in population size becau people are esntial for the economic prosperity(经济繁荣) and also responsible for the depletion(耗尽)of the Earth’s resources. |
Population growth | 人口增长 | Population growth refers to the rate of change in the size of a country’s population. Change in population size can have huge and long-lasting effects on the world’s economy and the natural environment. Birth rate, death rate, fertility rate and net migration are the four key factors which affect population growth. Other factors are life expectancy, social changes, natural disasters etc. |
Birth rate | 出生率 | The birth rate measures the number of live birth per thousand of the population in a year. The higher the birth rate, the greater its population growth will tend to be. |
Fertility rate | 生育率 | Fertility rate measures the average number of children born per woman, thus indicating the potential for population change in a country. Fertility rates above two children indicate a growing population with a declining median age for the population. Fertility rates tend to fall as an economy develops, due to the higher opportunity cost of raising children. (Singapore, Macau,HK lowest 0.78, 0.92, 1.09) |
Net migration rate | 净移民率 | Net migration rate = immigration(移入)- emigration(移出) |
silence的意思demographics | 人口特征 格莱美红毯人口统计学的 | Demographics include differences in the composition (组成)of gender, age distribution and the dependency rate |
Dependency ratio | 依赖人口比例 | Dependency ratio = dependency population/working population. Dependent population include all tho between 0-14 and tho aged 65 and above as well as full time students and the unemployed. The higher the dependency ratio, the greater the tax burden on the working population to support tho who are not economically active. It can ri due to high birth rates, higher compulsory school leaving age or social changes. | pillow是什么意思
Optimum population | 最优人口数量 playground的中文是什么意思 | A country is under-populated if it does not have sufficient labour to make the best u of resources. While a country is over-populated if the population is too large, given the available resources of the country. |
Malthusian growth theory | 马尔萨斯(1766-1834)人口发展理论 | Malthus suggested that uncontrolled population growth would put pressures on the resources of the country, thus negatively impacting living standards. This is becau population growth occurs at a geometric rate, 1, whereas food production only grow at an arithmetic rate,1.2, bt sv |
典范英语1 |
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