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Structure of the World System
A World Model Structure and Assumptions
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1970 conditions accumulation assumed assumptions 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 environment equation equilibrium exponential growth feedback loops Figure food production food ratio food supply IIIII increase industrialization influence INTERPOLATION limit LOGICAL FUNCTION material standard mental models mode MULTIPLIER DIMENSIONLESS natural resources Natural-resource-usage rate negative loop NREM NRUN1 POLCM pollution absorption pollution crisis pollution POL pollution ratio POLR POLLUTION UNITS pollution-absorption POLN1 population and capital population density present 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/YEAR UNITS/YEAR usage rate variable world model world population world system