2.4. Population Growth

The population growth or population change refers to the change in number of inhabitants of a territory during a specific period of time. This change may be positive as well as negative. It can be expressed either in terms of absolute numbers or in terms of percentage. Population change in an area is an important indicator of economic development, social upliftment and historical and cultural background of the region.

Population growth, also known as population change, is the variation in the number of people living in a specific area over a certain time frame. This variation can be an increase or a decrease in population numbers and can be quantified in simple numerical terms or as a percentage increase or decrease. Understanding these changes is crucial because they reflect the development status of a region economically, socially, and culturally.

Think of population change like the balance in your piggy bank. When you add coins (births or migration), the amount increases. When you take coins out (deaths or emigration), the amount decreases. Tracking the balance helps you understand if you're saving more or spending more.

There are three components of population change – births, deaths and migration. The crude birth rate (CBR) is expressed as number of live births in a year per thousand of population. It is calculated as: CBR = (B/P) × 1000, where B = live births during the year and P = estimated mid-year population of the area.

Population change is influenced by three main factors: births (how many new babies are born), deaths (how many people die), and migration (how many people move in or out of an area). The crude birth rate (CBR) helps quantify how many babies are born in a population over a year. The formula provided allows us to calculate this rate, enabling us to understand how many people are added to the population through births.

Imagine a small town where every year, 50 babies are born. With a total population of 10,000, you can easily calculate the CBR. Just like determining how many new members join a club each year gives an idea of its growth, the CBR informs us of the population growth trend in the town.

Death rate plays an active role in population change. Population growth occurs not only by increasing birth rate but also due to decreasing death rate. Crude Death Rate (CDR) is a simple method of measuring mortality of any area. CDR is expressed in terms of number of deaths in a particular year per thousand of population in a particular region and is calculated as: CDR = (D/P) × 1000, where D = number of deaths and P = estimated mid-year population of that year.

The death rate is crucial for understanding overall population changes. If deaths in a population decrease, it can contribute significantly to population growth, even if the birth rate remains constant. The crude death rate (CDR) helps to record how many people die in a given year, enabling easier calculations to assess the overall health and longevity of the population.

Consider a family garden where every plant can thrive if watered and given sunlight. If some plants do not survive due to pests (deaths), the overall number of plants decreases, while new growth from seeds (births) might not keep up. In population terms, managing death rates is just as important as encouraging births for healthy population growth.

Natural Growth of Population: This is the population increase by difference between births and deaths in a particular region between two points of time. Actual Growth of Population: This is calculated as Births – Deaths + In Migration – Out Migration.

Natural growth refers to how the population changes when taking the number of births and subtracting the number of deaths. This growth can be seen without considering migration factors. In contrast, actual growth also includes people moving in or out of the population, giving a more complete picture of how the population is changing in total.

Think of your school’s student body. If students transfer out (deaths in population terms) and new students enroll (births), only looking at enrollments won’t tell you the full story. You need to account for those who left to know if the school population is growing or shrinking.

Apart from birth and death there is another way by which the population size changes – migration. When people move from one place to another, the place they move from is called the Place of Origin, and the place they move to is called the Place of Destination. Migration may be interpreted as a spontaneous effort to achieve a better balance between population and resources.

Migration is another important factor that contributes to population change. It refers to people moving from their home area (place of origin) to another area (place of destination). This movement can be driven by various factors, often a desire for better opportunities or living conditions. Understanding migration allows us to see how populations shift and redistribute over time.

Imagine a family deciding to move to a bigger city for better jobs. Their old house (place of origin) empties out while new families move to fill it or stay nearby. This shifting is akin to rearranging items in a closet to make room for new shoes, reflecting changing needs and preferences.

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