World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 25
... POLAT POLATT Pollution- 34 absorption time Figure 2-4 Negative loop controlling pollution absorption and positive loop that can cause regenerative accumulation of pollution . defines a negative - feedback loop . The preceding simple ...
... POLAT POLATT Pollution- 34 absorption time Figure 2-4 Negative loop controlling pollution absorption and positive loop that can cause regenerative accumulation of pollution . defines a negative - feedback loop . The preceding simple ...
Page 56
... POLAT . In simple decay processes , decay time is a constant . Such would be true for the spontaneous decay of radioactive materials for which one speaks of the half - life , which is the time required for half of any remaining material ...
... POLAT . In simple decay processes , decay time is a constant . Such would be true for the spontaneous decay of radioactive materials for which one speaks of the half - life , which is the time required for half of any remaining material ...
Page 57
... POLAT.K 33 , R POLA POL POLAT · · · POLLUTION ABSORPTION ( POLLUTION UNITS / YEAR ) POLLUTION ( POLLUTION UNITS ) POLLUTION - ABSORPTION TIME ( YEARS ) 3.34 Pollution - Absorption Time POLAT Figure 3-15 shows how the pollution ...
... POLAT.K 33 , R POLA POL POLAT · · · POLLUTION ABSORPTION ( POLLUTION UNITS / YEAR ) POLLUTION ( POLLUTION UNITS ) POLLUTION - ABSORPTION TIME ( YEARS ) 3.34 Pollution - Absorption Time POLAT Figure 3-15 shows how the pollution ...
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