英语论文网

c progression. Population growth is faster than the growth of means of subsistence, and Malthus's theory of population growth draws attention to the proportionality of population and means of subsistence, trying to avoid the rapid population growth. The application of the theory in economics embodies the law of diminishing marginal effect, that is to say, the input of a factor of production is increased continuously under the condition of the same level of technology and the input of other factors, when the input of the factor of production is less than a specified value, the marginal product brought by the increasing input quantity of the factor is continuously increasing, when the input quantity of the variable factor exceeds the specified value, the marginal product produced by the increment of the input of the factor is diminishing (Shen, 2013).
New Zealand has a land area of 268,680 km2 and a population of only 4.64 million. New Zealand is a highly developed capitalist country. New Zealand needs a lot of talents because of economic development. New Zealand has maintained a relatively low unemployment rate. A large number of talents are needed in agriculture, fisheries, high-tech industries, as New Zealand has a large land area and small population, the small population is unable to meet the demands of economic development, making it one of the most popular immigrant countries in the world. From 2010 to 2015, the New Zealand government has been pursuing a policy of encouraging immigrants, each year number of immigrants to New Zealand increased from about 20,000 to about 70,000 (Lee, Lusk, Mirosa and Oey, 2016), the arrival of these immigrants provided human, capital and wisdom supplement to the local economy of New Zealand, it has also played an important role in promoting the development of the New Zealand economy. However, with the increase in immigration, the New Zealand government found that the role of migration in promotion of New Zealand's economy was diminishing, and it even brought new economic problems, such as low skilled immigrants, which was an unfavorable factor of industrial upgrading, and lowered the average wage of local population, pushing up real estate prices and inflation to cause local dissatisfaction. New immigrants are concentrated in the areas of hotel management, retail and elderly care industries, while employment gap in the construction, health and information and communication technologies industries are still not filled. Immigration has not met New Zealand's needs for talents as what has been envisaged originally (Lee, Lusk, Mirosa and Oey, 2016).
The New Zealand government tried to promote economic development by attracting immigrants, but with the increase in immigration, the role of migration in promotion of economy showed the state of a diminishing marginal effect. According to Malthus's demographic theory, the reason for this phenomenon was that the New Zealand government's work in immigration audit, management, training and so on has not escalated with the increase of immigrants. The New Zealand government was also aware of the problem, in 2016, Immigration New Zealand announced the new immigration policy that in the next two years, it approved a total reduction of 5,000 immigrants to reduce the number of immigrants, so as to avoid the excessive immigration to increase the economic and social prob