AP class topic 2.6 Malthus' Theory on Population

Thomas Malthus (1766-1834) was a British economist.
He is known for raising concerns about population growth outpacing food production.

Malthus warned that population would outpace food supply.
He believed population grows geometrically (exponentially), while food supply grows arithmetically (linearly).
$Population Growth = Exponential$
$Food Supply = Arithmetic$
Malthus made his predictions after Britain entered stage two of the demographic transition model (DTM).
Stage two is characterized by a drop in death rate and a high birth rate, leading to explosive population growth.
Malthus was concerned that when population outpaces food supply, it leads to crisis, starvation, and chaos.
He was trying to warn that there would not be enough food for the people of Britain.

Many people didn't believe Malthus was right, and some considered him a "conspiracy theorist." Some considered him too alarmist and anti-family.
There was resistance to his ideas because not many places were entering stage two of the DTM at the time.
Some religious groups saw him as anti-family because he was perceived as discouraging people from having children.
Discouraging childbearing was seen as anti-patriotic and against religious obligations.

Neo-Malthusians still see the validity in Malthus' ideas, especially with the dramatic increase in world population in the 20th century.
They point to the loss of Earth's natural resources and unprecedented population growth as indicators that Malthus' ideas are still relevant.
They believe that we could still hit a crisis point if we cannot produce more food or reduce population growth.

An AP Human Geography exam question from 2011 asks students to analyze Malthus' theory.
The question states that Malthus argued population growth will inevitably outpace food production, resulting in widespread famine.
Part one of the question asks for two reasons why some geographers today believe Malthus' theory can be used to predict future population issues.
Part two asks for two reasons why some geographers today believe Malthus' theory cannot be used to predict future population issues.

Population and food production are growing as Malthus predicted.
Population is growing exponentially, while food production is growing arithmetically.
Limited use of contraception or birth control in certain parts of the world.
Political, economic, and/or cultural policies or ideas still promote population growth in certain parts of the world.
Some places still value large families.
Some countries are still in stage two or three of the DTM.

Population and food production are not growing as Malthus predicted everywhere.
Widespread use of contraception in more developed countries (MDCs) leads to drastically reduced total fertility rates.
Political, economic, or cultural policies or ideas reduce population growth.
Successful policies have dramatically reduced birth rates in countries like China and South Korea.
Some countries are in stage four or five of the DTM, experiencing very low or negative population growth.
New farming techniques allow for more food production than in the past.

Thomas Malthus' theory on population growth can help us understand the challenges of food production and population growth.
He was unable to perfectly predict advancements in food production and the slowing of population growth as countries moved through the DTM.
History has value, but it is limited by its historical perspective.