Population will always grow faster than the food supply, leading to periods of overpopulation, war, and famine. At that time population of England was increasing rapidly.
Thomas Robert Malthus wrote in his 1798 book
Essay on Principle of Population "by nature, human foods increases in a slow arithmatical ratio but man himself increases in a quick geometrical ratio unless want and vice stopped him." Human population is supposed to double in every 25 years.
- Food is necessary to the life of man.
- Human population increases in geometrical progression like 2,4,8,16 but food production increases in arithmatical progression like 2,4,6,8.
- Population always increases when the means of subsistence increases prevented by powerful and obvious checks. In other words size of population is determine by the availability of food.