“自然增长”是经济学，地理学，社会学和人口研究中使用的术语。简单来说，就是出生率减去死亡率。在这种情况下，出生率几乎总是指特定人口中每千人的出生年数。死亡率的定义方式与每年特定人口中每千人的死亡人数相同。因为该术语总是根据给定的出生率减去给定的死亡率来定义，所以“自然增长”本身就是一种比率，即。例如，出生人数比死亡人数增加的净率。它也是一个比率，其中指定时期内的出生率是分子，同一时期的死亡率是分母。该术语通常用其首字母缩写词RNI（自然增长率）来表示。另请注意，如果人口在下降，则RNI率可能为负，i。例如，实际上是自然减少的速度。人口增长如何获得“自然”资格是随着时间的推移而丢失的信息，但可能源于马尔萨斯，这位早期的经济学家在他的“人口原理论文”（1798）中首次提出了基于数学的人口增长理论。根据他对植物研究的结论，马尔萨斯提出了令人震惊的“自然”人口增长率，提出人类种群呈指数增长 – 意味着它们加倍并加倍于无限 – 与食物增长的算术进展形成鲜明对比。马尔萨斯提出的这两个增长率之间的差异将不可避免地以灾难结束，人类将会饿死。为了避免这场灾难，马尔萨斯提出了“道德约束”，即人类在生命的晚期结婚，并且只有当他们明显拥有支持家庭的经济资源时才会结婚。马尔萨斯对自然人口增长的研究是一项受欢迎的研究，这项研究从未被系统地研究过。关于人口原则的论文仍然是一份有价值的历史文献。然而，事实证明，他的结论介于“不完全正确”和“完全错误”之间。他预测，在他的着作200年内，世界人口将增加到大约2560亿，但食品供应的增加将只支持90亿。但在2000年，世界人口只有60多亿。该人口的很大一部分缺乏营养，饥饿仍然存在，并且仍然是一个重要的世界问题，但饥饿率从未接近马尔萨斯提出的96％的饥饿率。他的结论“并不完全正确”，因为马尔萨斯提出的“自然增长”可能存在并且实际上可能存在于他没有考虑的因素之中，其中最重要的是不久后研究的现象。达尔文指出，人口正在相互竞争 – 在自然界（我们是其中的一部分）的任何地方都存在着生存的战争，并且缺乏刻意的补救措施，只有适者生存。
“Natural growth” is a term used in economics, geography, sociology, and population research. Simply put, it is the birth rate minus the death rate. In this case, the birth rate almost always refers to the number of years of birth per thousand people in a particular population. Mortality is defined in the same way as the number of deaths per 1,000 people in a given population each year. Because the term is always defined by a given birth rate minus a given mortality rate, “natural growth” is itself a ratio, ie. For example, the net birth rate is greater than the number of deaths. It is also a ratio in which the birth rate in a given period is a numerator and the mortality rate in the same period is a denominator. This term is usually expressed by its acronym RNI (natural growth rate). Also note that if the population is declining, the RNI rate may be negative, i. For example, it is actually a natural rate of reduction. How population growth gains “natural” qualifications is information that has been lost over time, but may have originated from Malthus, an early economist who first proposed mathematics based in his “Population Principles Paper” (1798). Population growth theory. According to his conclusions on plant research, Malthus proposed a shocking “natural” population growth rate, suggesting that human populations exponentially – meaning they double and double infinity – in stark contrast to the arithmetic progression of food growth. The difference between these two growth rates proposed by Malthus will inevitably end with a disaster and humanity will starve to death. In order to avoid this disaster, Malthus proposed “moral restraint”, that is, human beings get married in the late stages of life, and only when they obviously have the economic resources to support the family. Malthus’s study of natural population growth is a popular study that has never been systematically studied. The paper on population principles is still a valuable historical document. However, it turns out that his conclusion is between “not completely correct” and “completely wrong.” He predicted that within 200 years of his work, the world population will increase to about 256 billion, but the increase in food supply will only support 9 billion. But in 2000, the world’s population was only over 6 billion. A large part of the population lacks nutrition, hunger still exists, and remains an important world issue, but the hunger rate has never approached the 96% hunger rate proposed by Malthus. His conclusion is “not entirely correct,” because Malthus’s “natural growth” may exist and may actually exist among factors he did not consider, the most important of which is the phenomenon that will be studied soon. Darwin pointed out that the population is competing with each other – there is a war of survival anywhere in nature (we are part of it) and there is no deliberate remedy, only the fittest.