World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 38
... usage rate NRUR multiplied by the time interval between compu- tations . An initial value is needed for each level variable . We define the natural- resource - usage rate NRUR in 1970 as being 1 natural resource unit per person . This ...
... usage rate NRUR multiplied by the time interval between compu- tations . An initial value is needed for each level variable . We define the natural- resource - usage rate NRUR in 1970 as being 1 natural resource unit per person . This ...
Page 39
... USAGE RATE ( NATURAL RESOURCE UNITS / YEAR ) NATURAL RESOURCES , INITIAL ( NATURAL - RESOURCE UNITS ) 3.9 Natural - Resource - Usage Rate NRUR Natural - resource - usage rate NRUR is determined by the population P multi- plied by the ...
... USAGE RATE ( NATURAL RESOURCE UNITS / YEAR ) NATURAL RESOURCES , INITIAL ( NATURAL - RESOURCE UNITS ) 3.9 Natural - Resource - Usage Rate NRUR Natural - resource - usage rate NRUR is determined by the population P multi- plied by the ...
Page 74
... usage ( or increase the assumed initial supply ) to see which mode of behavior next appears . 4.3 Pollution Crisis In a model of a social system , structure and numerical values can be changed to determine how the system behavior ...
... usage ( or increase the assumed initial supply ) to see which mode of behavior next appears . 4.3 Pollution Crisis In a model of a social system , structure and numerical values can be changed to determine how the system behavior ...
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