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Difficulty: MediumPopulation Migration Causes and Effects

A semi-urban local government area in Nigeria recorded a total mid-year population of 500,000500,000 in a specific census year. During this period, the area recorded 18,50018,500 in-migrants and 8,5008,500 out-migrants. What is the net migration rate per 1,0001,000 population for this area?

Answer: 20 per 1,000 population

Answer

The net migration rate for the area is 2020 per 1,0001,000 population.
The net migration rate is calculated using the demographic formula Net Migration Rate=In-migrants−Out-migrantsTotal Population×1,000\text{Net Migration Rate} = \frac{\text{In-migrants} - \text{Out-migrants}}{\text{Total Population}} \times 1,000. Substituting the given values gives 18,500−8,500500,000×1,000=10,000500,000×1,000=20\frac{18,500 - 8,500}{500,000} \times 1,000 = \frac{10,000}{500,000} \times 1,000 = 20 per 1,0001,000 population.

Step-by-Step Solution

1
Find the net migration volume
Net Migration Volume = 10,00010,000 people
Net migration represents the net gain or loss of population through movement into and out of an area, calculated as in-migrants minus out-migrants (18,500−8,50018,500 - 8,500).
2
Calculate the Net Migration Rate (NMR) per 1,0001,000 inhabitants
NMR = 2020 per 1,0001,000 population
The rate standardizes population growth from migration per thousand people using the formula NMR=(I−EP)×1,000\text{NMR} = \left(\frac{I - E}{P}\right) \times 1,000, where I=18,500I = 18,500, E=8,500E = 8,500, and P=500,000P = 500,000.

Key Concept

Net Migration Rate Calculation
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Topics

Population Migration Causes and Effects

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