World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 18
... cause the levels to change . A level accumulates the net quantity that results from the flow rates that add to and subtract from the level . The system levels fully describe the state or condition of a system at any point in time ...
... cause the levels to change . A level accumulates the net quantity that results from the flow rates that add to and subtract from the level . The system levels fully describe the state or condition of a system at any point in time ...
Page 22
... cause population to increase , remain stable , or decline . The birth loop in Figure 2-2 is positive feedback in character and generates population growth . An increase in population P causes , by way of the dashed information line , an ...
... cause population to increase , remain stable , or decline . The birth loop in Figure 2-2 is positive feedback in character and generates population growth . An increase in population P causes , by way of the dashed information line , an ...
Page 95
... cause that is plausible according to the lessons we have learned from simple systems , although this apparent cause is usually a coincident occurrence that , like the trouble symptom itself , is being produced by the feedback - loop ...
... cause that is plausible according to the lessons we have learned from simple systems , although this apparent cause is usually a coincident occurrence that , like the trouble symptom itself , is being produced by the feedback - loop ...
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