Calculate Keyfitz's population momentum M = e₀/(T × NRR) × (initial population / stable population), measuring the ratio of ultimate to current population when fertility instantly reaches replacement. Key metric for long-range population projections.
Enter the values for the scenario you are assessing. Calculate Keyfitz's population momentum M = e₀/(T × NRR) × (initial population / stable population), measuring the ratio of ultimate to current population when fertility instantly reaches replacement. Key metric for long-range population projections. Use the population momentum result to inform your calculation.