World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 61
... curve . The choice is arbitrary in picking the first relationship of the kind in Figure 3-17 . As scales begin to be ... curve displays a high sensitivity to crowding in the range of CR equal to 1 at the 1970 point . The curve is shown ...
... curve . The choice is arbitrary in picking the first relationship of the kind in Figure 3-17 . As scales begin to be ... curve displays a high sensitivity to crowding in the range of CR equal to 1 at the 1970 point . The curve is shown ...
Page 71
... curve prior to that year . The extension continues to rise along the slope that had characterized the first part of the century . But the actual curve has fallen away from the extended slope . The gap between expectation and reality is ...
... curve prior to that year . The extension continues to rise along the slope that had characterized the first part of the century . But the actual curve has fallen away from the extended slope . The gap between expectation and reality is ...
Page 73
... curve comes at the point of maximum downward slope of the curve for natural resources . Natural resources are falling fastest when the usage rate is the highest . Figure 4-4 is again from the original system and shows the generation and ...
... curve comes at the point of maximum downward slope of the curve for natural resources . Natural resources are falling fastest when the usage rate is the highest . Figure 4-4 is again from the original system and shows the generation and ...
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