World Dynamics

1970 conditions accumulation assumed assumptions average behavior billion birth rate normal birth-control program BRN1 capital accumulation capital investment CAPITAL UNITS CAPITAL-INVESTMENT DISCARD capital-investment ratio CAPITAL-INVESTMENT-IN-AGRICULTURE FRACTION cause Chapter CIAF Club of Rome coefficient computer model crowding ratio curve death rate normal decline dynamic ECIR effect effective-capital-investment ratio environment equations equilibrium exponential growth falling feedback loops Figure food production food ratio food supply increase industrialization influence INTERPOLATION IONLESS limit LOGICAL FUNCTION material standard mental models mode MULTIPLIER DIMENSIONLESS natural resources natural-resource-usage rate negative loop NREM pollution absorption pollution crisis pollution POL pollution ratio POLR POLLUTION UNITS pollution-absorption population and capital population control population density population growth pressures processes ratio CIR RATIO DIMENSIONLESS result Section shortage shows social systems SQUARE KILOMETERS standard of living structure system levels TABHL TABLE LOOK tion unit per person UNITS/PERSON UNITS/PERSON/YEAR UNITS/YEAR usage rate variable world model world population world system