This paper studies the relationship between population size and the rate of time preference (RTP) in pre-capitalist subsistence agricultural communities. The RTP is reflected in the community´s propensity to invest in and maintain new arable land that may be considered as an inherent characteristic of the considered community. Using a Malthusian framework, we show how communities with a low RTP end up with a high steady-state subsistence population compared to communities with a high RTP. Furthermore, unsustainable “optimum population” sizes are identified where consumption per capita has a maximal value. Finally, the paper shows that the population growth rate may have no bearing on the resulting subsistence steady-state population size. A population with a higher growth rate only reaches the subsistence steady-state population size faster and have a lower maximal consumption per capita along the path to the subsistence level.