Lack of employment opportunities
Pressure on the land (too little land to divide among family)
Many families don't own the own land
Overpopulation, resulting from a high birth rates
Starvation, resulting from either too little output for the people of the area, or crop failure.
Limited food production due to overgrazing, or to misuse of the land resulting in soil erosion or exhaustion
Mechanisation has caused a reduction in jobs available on the land together with, in many areas, reduced yields
Extreme physical conditions such a rugged mountains,...
Farming is hard work
Lack of services (schools, hospitals,...)
Lack of investment of money