Stage One: Very high CBR & CDR, Very low NIR, Most of human history was spent in this stage. , No country is in this stage anymore. , Stage Two: CBR remains high, CDR rapidly declines, Rapidly rising NIR, Much of Europe & North America entered this stage as a result of the Industrial Revolution & medical revolution. , Stage Three: CBR rapidly declines, CDR moderately declines, Moderate NIR, Cultural "lag" is realized & families start to have fewer children. , Stage Four: CBR very low, CDR low/slightly increasing, Zero or negative NIR, Zero population growth often occurs in this stage., Stage Five: CBR is still very low, CDR is still low or slightly increasing, Negative NIR occurs, A shortage of able-bodied workers will occur in this stage.,

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