A population decline (or depopulation) in humans is a reduction in a human population caused by short term events such as pandemics, wars, famines or other catastrophes, or by long-term demographic trends, as in sub-replacement fertility rate, or persistent emigration.
Even though short-term population shocks have caused terrible loss of life and human misery, sometimes lasting several centuries, over the long-term, stretching from prehistory to the present, this planet’s human population has continued to grow. However, current events suggest that this long-term trend may be coming to an end. Up until the beginning of the industrial revolution, global population grew very slowly. After about 1800 the growth rate accelerated to a peak of 2.1% annually in 1962; but since then, due to the world-wide collapse of the total fertility rate, it has declined to 1.1% today (2020). Long-term projections predict that the growth rate of the human population of this planet will continue to decline, and that by the end of the 21st Century, will reach zero.
An example of this emerging trend is Japan, whose population is currently (2015-2020) declining at the rate of 0.2% per year. By 2050 Europe’s population is projected to be declining at the rate of 0.3% per year.
Possible consequences of long-term national population decline can be positive or negative. If a country can increase its workforce productivity faster than its population is declining, the results, both in terms of its economy, the quality-of-life of its citizens, and the environment, can be positive. If it cannot increase workforce productivity faster than its population’s decline, the results can be mostly negative.
National efforts to confront population decline to-date have been focused on the possible negative economic consequences and have been centered around increasing the size of the nation’s workforce and the productivity of its workers.
A reduction over time in a region's population can be caused by sudden adverse events such as outbursts of infectious disease, famine, and war or by long-term trends, for example sub-replacement fertility, persistently low birth rates, high mortality rates, and continued emigration.
Short term population shocksEdit
Historical episodes of short-term human population decline have been common and have been caused by several factors.
- high death rates caused by disease, for example the Black Death that devastated Europe in the 14th and 17th centuries, the arrival of Old World diseases in the Americas during European colonization, and the Spanish flu pandemic after World War I,
- war, for example, the Mongol invasion of Europe in the 13th century that may have reduced the population of Hungary by 20-40%,
- civil unrest, for example the forced migration of the population of Syria because of the Syrian Civil War.
Less frequently, short term population declines are caused by genocide or mass execution. For example, it has been estimated that the Armenian genocide caused 1.5 million deaths, the Jewish Holocaust about 6 million, and, in the 1970s, the population of Cambodia declined because of wide-scale executions by the Khmer Rouge.
Long term historic trends in world population growthEdit
In spite of these short-term population shocks, world population has continued to grow. From pre-history (cir 10,000 BC) to the beginning of the Early Modern Period (generally 1500 – 1800), world population grew very slowly, around 0.04% per year. During that period, population growth was governed by conditions now labeled the “Malthusian Trap”.
After 1700, driven by increases in human productivity produced by the Industrial Revolution, population growth accelerated to around 0.6% per year, a rate that was over ten times the rate of population growth of the previous 12,000 years. This rapid increase in global population caused Malthus and others to raise the first concerns about “overpopulation”.
After World War I birth rates in the United States and many European countries fell below replacement level. This prompted concern about population decline. The recovery of the birth rate in most western countries around 1940 that produced the “baby boom”, with growth rates in the 1.0 – 1.5% range, and which peaked in 1962 at 2.1% per year, temporarily dispelled prior concerns about population decline, and the world was once again fearful of overpopulation.
But, after 1962 the global population growth rate started a long decline and today (the period 2015-2020) is estimated to be about 1.1%, half of its peak in 1962. Although still growing, global population is predicted to level out around the end of the 21st century, and some sources predict the start of a decline before then. The principle cause of this phenomenon is the abrupt decline in the global total fertility rate, from 5.0 in 1960 to 2.5 in 2016. The decline in the total fertility rate has occurred in every region of the world and has brought renewed concern for population decline.
The era of rapid global population increase, and concomitant concern about a population explosion, has been a relative short one compared with the span of human history. It began roughly at the beginning of the industrial revolution and appears to be now drawing to a close in the Western world.
Contemporary decline by countryEdit
The table below shows the countries that have been affected by population decline between 2010 and 2020. The term "population" used here is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship, except for refugees not permanently settled in the country of asylum, who are generally considered part of the population of the country of origin. This means that population growth in this table includes net changes from immigration and emigration. For a table of natural population changes, see list of countries by natural increase.
(1 July 2020)
|Avg annual rate of population change
|Avg annual rate of population change
|Low birth rate||High death rate||Emigration||Aging population||High rate of abortion|
|Bosnia and Herzegovina||3,280,819||-1.55||−0.89||Yes||Yes||Yes|
|Puerto Rico[Note 3]||2,860,853||-1.14||−3.34||Yes||Yes|
- Figure includes Abkhazia and South Ossetia.
- Includes the Pridnestrovian Moldavian Republic.
- Aftermaths of Hurricane Maria caused an extreme surge in the traditional migration flows to the U.S. mainland.
- Syrian Civil War that caused high civilian deaths and a massive refugee crisis.
- General socio-economic collapse following the War in Donbass.
- General socio-economic collapse caused by the ongoing political crisis.
Though Japan's natural increase turned negative as early as 2005, the 2010 census result figure was slightly higher, at just above 128 million, than the 2005 census. Factors implicated in the puzzling figures were more Japanese returnees than expected as well as changes in the methodology of data collection. However, the official count put the population as of October 1, 2015, at 127.1 million, down by 947,000 or 0.7% from the previous quinquennial census. The gender ratio is increasingly skewed; some 106 women per 100 men live in Japan. In 2019, Japan's population fell by a record-breaking 276,000; if immigration is excluded from the figures, the drop would have been 487,000. Given the population boom of the 1950s and 1960s, the total population is still 52% above 1950 levels.
Eastern Europe and former Soviet republicsEdit
Population in the ex-USSR and Eastern Europe is rapidly shrinking due to low birth rates, very high death rates (linked to alcoholism and high rates of infectious diseases such as AIDS and TB), as well as high emigration rates. In Russia and the former communist bloc, birth rates fell abruptly after the fall of the Soviet Union, and death rates generally rose sharply. In addition, in the 25 years after 1989, some 20 million people from Eastern Europe are estimated to have migrated to Western Europe or the United States.
Albania's population in 1989 recorded 3,182,417 people, the largest for any census. Since then, its population declined to an estimated 2,893,005 in January 2015. This represents a decrease of 10% in total population since the peak census figure.
Armenia's population peaked at 3,604,000 in 1991 and declined to 3,010,600 in the January 2015 state statistical estimate. This represents a 19.7% decrease in total population since the peak census figure.
Belarus's population peaked at 10,151,806 in 1989 Census, and declined to 9,480,868 as of 2015 as estimated by the state statistical service. This represents a 7.1% decline since the peak census figure.
Bosnia and HerzegovinaEdit
Bosnia and Herzegovina's population peaked at 4,377,033 in the 1991 Census, shortly before the Yugoslav wars that produced tens of thousands of civilian victims and refugees. The latest census of 2016 reported a population of 3,511,372. This represents a 19.8% decline since the peak census figure.
Bulgaria's population declined from a peak of 9,009,018 in 1989 and since 2001, has lost yet another 600,000 people, according to 2011 census preliminary figures to no more than 7.3 million, further down to 7,245,000. This represents a 24.3% decrease in total population since the peak, and a -0.82% annual rate in the last 10 years.
Croatia's population declined from 4,784,265 in 1991 to 4,456,096 (by old statistical method) of which 4,284,889 are permanent residents (by new statistical method), in 2011, a decline of 8% (11.5% by the new definition of permanent residency in 2011 census). The main reasons for the decline since 1991 are: low birth rates, emigration and war in Croatia. From 2001 and 2011 main reason for the drop in population is due to a difference in definition of permanent residency used in censuses till 2001 (censuses of 1948, 1953, 1961, 1971, 1981, 1991 and 2001) and the one used in 2011.
In the last Soviet census of 1989, it had a population of 1,565,662, which was close to its peak population. The state statistics reported an estimate of 1,314,370 for 2016. This represents a 19.2% decline since the peak census figure.
In the last Soviet census of 1989, it had a population of 5,400,841, which was close to its peak population. The state statistics reported an estimate of 4,010,000 for 2014 Census, which includes estimated numbers for quasi-independent Abkhazia and South Ossetia. This represents a 25.7% decline since the peak census figure, but nevertheless somewhat higher than the 1950 population.
When Latvia split from the Soviet Union, it had a population of 2,666,567, which was very close to its peak population. The latest census recorded a population of 2,067,887 in 2011, while the state statistics reported an estimate of 1,986,086 for 2015. This represents a 25.5% decline since the peak census figure, only one of two nations worldwide falling below 1950 levels. The decline is caused by both a negative natural population growth (more deaths than births) and a negative net migration rate.
When Lithuania split from the Soviet Union, it had a population of 3.7 million, which was close to its peak population. The latest census recorded a population of 3.05 million in 2011, down from 3.4 million in 2001, further falling to 2,988,000 in September 1, 2012. This represents a 23.8% decline since the peak census figure, and some 13.7% since 2001.
Ukraine census in 1989 resulted in 51,452,034 people. Ukraine's own estimates show a peak of 52,244,000 people in 1993; however, this number has plummeted to 45,439,822 as of December 1, 2013. Having lost Crimean territory and experienced war, the population has plunged to 42,981,850 as of August 2014. This represents a 19.7% decrease in total population since the peak figure, but 16.8% above the 1950 population even without Crimea. Its absolute total decline (9,263,000) since its peak population is the highest of all nations; this includes loss of territory and heavy net emigration. Eastern Ukraine may yet lose many Russian-speaking citizens due to new Russian citizenship law.
Hungary's population peaked in 1980, at 10,709,000, and has continued its decline to under 10 million as of August 2010. This represents a decline of 7.1% since its peak; however, compared to neighbors situated to the East, Hungary peaked almost a decade earlier yet the rate has been far more modest, averaging -0.23% a year over the period.
Romania's 1991 census showed 23,185,084 people, and the October 2011 census recorded 20,121,641 people, while the state statistical estimate for 2014 is 19,947,311. This represents a decrease of 16.2% since the historical peak in 1991.
Serbia recorded a peak census population of 7,576,837 in 1991, falling to 7,186,862 in the 2011 census. That represents a decline of 5.1% since its peak census figure.
The decline in Russia's total population is among the largest in numbers, but not in percentage. After having peaked at 148,689,000 in 1991, the population then decreased, falling to 142,737,196 by 2008. This represents a 4.0% decrease in total population since the peak census figure. However, since then the Russian population has risen to 146,870,000 in 2018. This recent trend can be attributed to a lower death rate, higher birth rate, the annexation of Crimea and continued immigration, mostly from Ukraine and Armenia. It is some 40% above the 1950 population.
In Germany a decades-long tendency to population decline has been offset by waves of immigration. The 2011 national census recorded a population of 80.2 million people. At the end of 2012 it had risen to 82 million according to federal estimates. This represents about 14% increase over 1950.
In the current area of the Republic of Ireland, the population has fluctuated dramatically. The population of Ireland was 8 million in 1841, but it dropped due to the Irish famine and later emigration. The population of the Republic of Ireland hit a bottom at 2.8 million in the 1961 census, but it then rose and in 2011 it was 4.58 million. As of 2020 it is estimated to be just under 5 million according to the country's Central Statistics Office 
Declines within regions or ethnic groups of a countryEdit
In spite of a growing population at a national level, some formerly large American municipalities have dramatically shrunk after the Second World War, and in particular during the 1950s-1970s, due to suburbanization, urban decay, race riots, high crime rates, deindustrialization and emigration from the Rust Belt to the Sun Belt. For instance, Detroit's population peaked at almost 2 million in the 1950s and then shrunk to less than 700,000 by 2020. Other cities whose populations have dramatically shrunk since the 1950 include Baltimore, Buffalo, Cincinnati, Cleveland, Flint, Gary, New Orleans, St. Louis, Pittsburgh, Scranton, Youngstown, Wilmington (Delaware). In addition, the depopulation of the Great Plains, caused by a very high rate of rural flight from isolated agricultural counties, has been going on since the 1930s.
In addition, starting from the 1950s the United States have witnessed the phenomenon of the white flight or white exodus , the large-scale migration of people of various European ancestries from racially mixed urban regions to more racially homogeneous suburban or exurban regions. The term has more recently been applied to other migrations by whites, from older, inner suburbs to rural areas, as well as from the U.S. Northeast and Midwest to the milder climate in the Southeast and Southwest. Migration of middle-class white populations was observed during the Civil rights movement in the 1950s and 1960s out of cities such as Cleveland, Detroit, Kansas City and Oakland, although racial segregation of public schools had ended there long before the Supreme Court of the United States' decision Brown v. Board of Education in 1954. In the 1970s, attempts to achieve effective desegregation (or "integration") by means of forced busing in some areas led to more families' moving out of former areas. More recently, as of 2018, California had the largest ethnic/racial minority population in the United States; Non-Hispanic whites decreased from about 76.3 - 78% of the state's population in 1970 to 36.6%% in 2018 and 39.3% of the total population was Hispanic-Latino (of any race).
The term 'white flight' has also been used for large-scale post-colonial emigration of whites from Africa, or parts of that continent, driven by levels of violent crime and anti-colonial state policies. In recent decades, there has been a steady proportional decline in South Africa's white community, due to higher birth rates among other South African ethnic groups, as well as a high rate of emigration. In 1977, there were 4.3 million White South Africans, constituting 16.4% of the population at the time. As of 2016, it is estimated that at least 800,000 whites have emigrated since 1995,  citing violent and racially motivated black on white crime as the main reason, as well as the lack of employment opportunities for whites.
Predictions of the net economic (and other) effects from a slow and continuous population decline (e.g. due to low fertility rates) are mainly theoretical since such a phenomenon is a relatively new and unprecedented one. The results of many of these studies show that the estimated impact of population growth on economic growth is generally small and can be positive, negative, or nonexistent. A recent meta-study found no relationship between population growth and economic growth.
Possible positive effectsEdit
The effects of a declining population can be positive. The single best gauge of economic success is the growth of GDP per person, not total GDP. GDP per person (also known as GDP per capita or per capita GDP) is a rough proxy for average living standards. A country can both increase its average living standard and grow total GDP even though its population growth is low or even negative. The economies of both Japan and Germany went into recovery around the time their populations began to decline (2003–2006). In other words, both the total and per capita GDP in both countries grew more rapidly after 2005 than before. Russia's economy also began to grow rapidly from 1999 onward, even though its population had been shrinking since 1992–93. Many Eastern European countries have been experiencing similar effects to Russia. Such renewed growth calls into question the conventional wisdom that economic growth requires population growth, or that economic growth is impossible during a population decline.
More recently (2009–2017) Japan has experienced a higher growth of GDP per capita than the United States, even though its population declined over that period. In the United States, the relationship between population growth and growth of GDP per capita has been found to be empirically insignificant. All of this is further proof that individual prosperity can grow during periods of population decline.
Attempting to better understand the economic impact of these pluses and minuses, Lee et al. analyzed data from 40 countries. They found that fertility well above replacement and population growth would typically be most beneficial for government budgets. However, fertility near replacement and population stability would be most beneficial for standards of living when the analysis includes the effects of age structure on families as well as governments. And fertility moderately below replacement and population decline would maximize standards of living when the cost of providing capital for a growing labor force is taken into account.
A focus on productivity growth that leads to an increase in both per capita GDP and total GDP can bring other benefits to:
- the workforce through higher wages, benefits and better working conditions
- customers through lower prices
- owners and shareholders through higher profits
- the environment through more money for investment in more stringent environmental protection
- governments through higher tax proceeds to fund government activities
Another approach to possible positive effects of population decline is to consider Earth's carrying capacity. The human carrying capacity of the Earth is estimated to be 500 million according to the National Strategy for a Sustainable America, other authors estimate 1 to 12 billion. According to these studies, the human carrying capacity has already been exceeded or would be exceeded by the year 2100, therefore a global population decline would counteract the negative effects of human overpopulation.
Possible negative effectsEdit
The effects of a declining population can also be negative. As a country’s population declines, GDP growth may grow even more slowly or may even decline. If the decline in total population is not matched by an equal or greater increase in productivity (GDP/capita), and if that condition continues from one calendar quarter to the next, it follows that a country would experience a decline in GDP, known as an economic recession. If these conditions become permanent, the country could find itself in a permanent recession.
Other possible negative impacts of a declining population are:
- A rise in the dependency ratio which would increase the economic pressure on the work force
- A crisis in end of life care for the elderly because there are insufficient caregivers for them
- Difficulties in funding entitlement programs because there are fewer workers relative to retirees
- A decline in military strength
- A decline in innovation since change comes from the young
- A strain on mental health caused by permanent recession 
- Deflation caused by the ageing population 
All these negative effects could be summarized under the heading of “Underpopulation”. Underpopulation is usually defined as a state in which a country's population has declined too much to support its current economic system.
Population decline can cause internal population pressures that then lead to secondary effects such as ethnic conflict, forced refugee flows, and hyper-nationalism. This is particularly true in regions where different ethnic or racial groups have different growth rates. An example of this is white nationalism. White nationalists seek to ensure the survival of the white race, and the cultures of historically white nations. Many white nationalists believe that white people should therefore maintain a demographic majority and that mass immigration of non-whites and low birth rates among whites are threatening the white race. Low fertility rates that cause long-term population decline can also lead to population ageing, an imbalance in the population age structure. Population ageing in Europe due to low fertility rates has given rise to concerns about its impact on social cohesion.
A smaller national population can also have geo-strategic effects, but the correlation between population and power is a tenuous one. Technology and resources often play more significant roles. Since WWII the “static” theory saw a population's absolute size as being one of the components of a country’s national power. More recently, the "human capital" theory has emerged. This view holds that the quality and skill level of a labor force and the technology and resources available to it are more important than simply a nation's population size. While there were in the past advantages to high fertility rates, that "demographic dividend" has now largely disappeared.
National efforts to confront declining populationsEdit
A country with a declining population will struggle to fund public services such as health care, old age benefits, defense, education, water and sewage infrastructure, etc. In order to maintain some level of economic growth and continue to improve its citizens’ quality of life, national efforts to confront declining populations will tend to focus on the threat of a declining GDP. Because a country’s GDP is dependent on the size and productivity of its workforce, a country confronted with a declining population, will focus on increasing the size and productivity of that workforce.
Increase the size of the workforceEdit
Policies that could increase the size of the workforce include:
- Encourage more women to join the workforce. Encouraging those women in the working age population who are not working to find jobs would increase the size of the workforce.
- Stop the decline of men in the workforce. In the United States the labor force participation of men has been falling since the late 1960s.
- Increase the retirement age. Increasing the retirement age has the effect of increasing the working age population.
- Increase immigration. A country can increase the size of its workforce by importing more migrants into their working age population.
- Natalism. Natalism is a set of government policies and cultural changes that promote parenthood and encourage women to bear more children.
Increase the productivity of the workforceEdit
Increasing the productivity of the workforce comes from creating new technology and new ways of doing things followed by capital investments in that technology and training in those new ways that works to spread them throughout the applicable workforce. In the context of a stable or declining population, increasing workforce productivity is better than mostly short-term efforts to increase the size of the workforce.
Alternative concept relative to skillsEdit
Sometimes the concept of population decline is applied where there has been considerable emigration of skilled professionals. In such a case, the government may have ceased to reward or value certain skills (e.g. science, medicine and engineering), and sectors of the economy such as health care and technology may go into decline. Such characterizations have been made of Italy, Bulgaria and Russia in the period starting about 1990.
Long-term future trendsEdit
A long-term population decline is typically caused by sub-replacement fertility, coupled with a net immigration rate that fails to compensate the excess of deaths over births. A long-term decline is accompanied by population aging and creates an increase in the ratio of retirees to workers and children. When a sub-replacement fertility rate remains constant, population decline accelerates over the long term.
Because of the global decline in the fertility rate, projections of future global population show a marked slowing of population growth and the possibility of long-term decline.
The table below summarizes the United Nations' predictions of future population growth. The UN divides the world into six regions. Their forecast shows that during the period 2045-2050 Europe's population will be in decline and all other regions will experience significant reductions in growth. Furthermore, the UN predicts that by the end of the 21st century (the period 2095-2100) three of these regions will be showing population decline and global population growth will be zero.
|Latin America & the Caribbean||0.84||0.21||-0.46|
Note: the UN’s methods for generating these numbers is explained at this reference.
The table shows that the UN predicts long-term decline of population growth rates in every region; however, short-term baby booms and healthcare improvements, among other factors, can cause reversals of trends. Population declines in Russia (1995-2010), Germany (1975-1985), and Ireland (1850-1960) have seen long-term reversals. The UK, having seen almost zero growth during the period 1975-1985, is now (2015-2020) growing at 0.6% per year.
- Biodiversity loss
- Birth dearth
- Societal collapse
- Negative Population Growth
- Human population control
- Political demography
- Population cycle
- Population growth
- Rural flight
- Sub-replacement fertility
- Zero population growth
- Church of Euthanasia
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