Consumption is determined by multiplying Population by consumption.per.day. Births is determined by multiplying Population by birth.fraction. Since the birth.fraction is constant, the larger the Population, the larger the births flow. This is a compounding flow.
Deaths is determined by multiplying Population by the death.fraction.
This is a draining flow. The birth.fraction is set at a constant of .2. food . Food.per.capita is determined by dividing Food by Population. Consumption.per.day tends to increase as food.per.capita increases. Death.fraction is defined as a graphical function in which death.fraction is a function of food.per.capita.