World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 23
... loop are met . If there were no constraint to control it , population would increase forever according to the exponential growth pattern created by positive - feedback loops . But the death loop is negative . As population grows , the ...
... loop are met . If there were no constraint to control it , population would increase forever according to the exponential growth pattern created by positive - feedback loops . But the death loop is negative . As population grows , the ...
Page 25
... Negative loop controlling pollution absorption and positive loop that can cause regenerative accumulation of pollution . defines a negative - feedback loop . The preceding simple description assumes that the time - constant of pollution ...
... Negative loop controlling pollution absorption and positive loop that can cause regenerative accumulation of pollution . defines a negative - feedback loop . The preceding simple description assumes that the time - constant of pollution ...
Page 30
... negative loop . The positive - feedback loop in Figure 2-3 and the negative - feedback structure in Figure 2-8 share a common point at the effective - capital - investment ratio ECIR . Through this common point , the subsystem of Figure ...
... negative loop . The positive - feedback loop in Figure 2-3 and the negative - feedback structure in Figure 2-8 share a common point at the effective - capital - investment ratio ECIR . Through this common point , the subsystem of Figure ...
Contents
Introduction | 1 |
Structure of the World System | 17 |
A World Model Structure and Assumptions | 31 |
Copyright | |
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1970 conditions assumed assumptions behavior birth rate normal birth-control program BRFM BRN1 capital investment CAPITAL UNITS CAPITAL UNITS/PERSON CAPITAL-INVESTMENT DISCARD capital-investment ratio CAPITAL-INVESTMENT-IN-AGRICULTURE FRACTION Chapter CI=C CIAF CIGN1 Club of Rome computer model crowding ratio curve decline DRFM ECIR effect effective-capital-investment ratio environment equations equilibrium exponential growth food production food ratio food supply FPMT in-agriculture fraction increase industrialization INTERPOLATION Limits to Growth LOGICAL FUNCTION Main Street Cambridge material standard mental models MULTIPLIER DIMENSIONLESS natural resources natural-resource Natural-resource-usage rate negative loop NR=N NREM NREMT NRUN1 POLN1 physical limits physical stress POLAT pollution absorption pollution crisis pollution-absorption population and capital population density PRESENT ORIGINAL pressures processes QL-Q ratio CIR RATIO DIMENSIONLESS rise Section sector shortage social stress social systems standard of living structure system levels TABHL TABLE LOOK tion units per person UNITS/PERSON/YEAR UNITS/YEAR usage rate variable world model world population world system