World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 18
... represented by using only levels and rates . The two kinds of variables are necessary but at the same time sufficient for representing any system . Full explanation of these and other prin- ciples of structure and the principles of the ...
... represented by using only levels and rates . The two kinds of variables are necessary but at the same time sufficient for representing any system . Full explanation of these and other prin- ciples of structure and the principles of the ...
Page 53
... represented by a simple aging process . A fraction of the capital is discarded each year . This fraction is the capital - invest- ment discard normal CIDN , having a value of 0.025 . This fraction represents an average life which is the ...
... represented by a simple aging process . A fraction of the capital is discarded each year . This fraction is the capital - invest- ment discard normal CIDN , having a value of 0.025 . This fraction represents an average life which is the ...
Page 58
... represents the poisoning and destroying of the pollution - cleanup mechanisms . Small amounts of pollution are dissipated quickly . But large amounts can have a cumulative effect by inter- fering with the natural processes of ...
... represents the poisoning and destroying of the pollution - cleanup mechanisms . Small amounts of pollution are dissipated quickly . But large amounts can have a cumulative effect by inter- fering with the natural processes of ...
Contents
Introduction | 1 |
Structure of the World System | 17 |
A World Model Structure and Assumptions | 31 |
Copyright | |
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Common terms and phrases
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