a. Stage 1: High birth rate, high death rate; very slow growth, low RNI. In preindustrial society, death rates and birth rates were birth high and fluctuated rapidly according to natural events, such as drought and disease, to produce a relatively constant and young population. Children contributed to the economy of the household from an early age by carrying rater, firewood and messages, caring for younger siblings, sweeping, washing dishes, preparing food, and doing some work in the fields.
b. Stage 2: Death rate falls dramatically, birth rate remains high; high RNI. A consequences of the decline in CDR in Stage Two is an increasingly rapid rise in population growth, called the "population explosion"), as the gap between deaths and births grows wider.
c. Stage 3: Death rate remains low, birth rate drops; RNI slows. Stage Three moves the population towards stability through a decline in the birth rate.
d. Stage 4: Death rate low, birth rate low, low RNI (as in Stage 1). This occurs where birth and death rates are both low. Therefore, the total population is high and stable.
*Highest RNI is in Stage 2*
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