Birth rates and Death rates vary in diverse countries. If the birth rate is very low there will be a reduction in the population; if it is very high then upsurge will certainly follow. Sweden is considered to have a low birth rate, with these there is a possibility for the birth rates decline first in the said country. While in Mexico, have the highest birth rate during the 1950’s, there is a possibility that death rates decline first in this country. If there is a decrease of rates between this two it will both affect the population. The number of inhabitants has a capacity to be fewer. This could be a cause of the way the people are living, which may also affect the sufficiency of the primary needs of the whole population.