population momentum effect age grouppolyblend vs polyblend plus grout
Answer link 0000004010 00000 n While these determinants play a critical role in population growth rates, its important not to overlook population momentum the additional growth a population experiences after the fertility rate falls to replacement levels. China enacted its one-child policy in 1979, following a decade of a two-child policy. Population momentum is generally defined in terms of fertility, as the tendency for population growth to continue beyond the time that replacement level fertility has been achieved because of a high concentration of women in the childbearing years. Projecting populations is paramount to planning for the future, whether its on a local community scale, a national scale, or a global scale. o In many countries, social convention dictates a pattern in which males at marriage are slightly older than their spouses. Even if this generation continues a fertility rate trend below replacement levels, the sheer number of women bearing children will outnumber the overall deaths and keep the population growing for fifty to one hundred years. 0000005339 00000 n Population growth has a lot to do with the age structure of the population. PDF Population Momentum and Population Aging in Asia and Near-East Countries This field is for validation purposes and should be left unchanged. 0000028054 00000 n Natl Vital Stat Rep. 2007 Dec 28;56(9):1-39. Eventually, however, continued aging of the population accelerates declines in rates of natural increase and population growth. This last step takes the longest to complete.[2]. Both rates are within a span of a lifetime. The population below age 30 does not grow over the transition to stationarity and the ratio of initial to ultimate proportions under age 30 is virtually identical to momentum. The populations of all nations of the world are more or less diverse with respect to ethnicity or race. The birth rate is influenced by the relative number of women of reproductive age and by the rate at which they give birth. The first generation dies, and the new generation, the fourth, is equal to the third (because now fertility is replacement). ) 1. 0000001920 00000 n The inertia from Japans youth entering reproductive years kept the population growing for a few additional decades. Such divisions in populations often are regarded as socially important, and statistics by race and ethnic group are therefore commonly available. hTQn0St8^"ZdglNp 0#Nvk0gt He cannot be absent from the service because he is the organist of the church youth choir. Necessary cookies are absolutely essential for the website to function properly. In a human population, the population momentum effect is most likely to These cookies will be stored in your browser only with your consent.