World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 6
... factor of 4,000 , agricul- tural land declines by only 17 % , and the food ratio is essentially constant at its maximum value . But in the next 100 years , population rises further by only another factor of four while agricultural land ...
... factor of 4,000 , agricul- tural land declines by only 17 % , and the food ratio is essentially constant at its maximum value . But in the next 100 years , population rises further by only another factor of four while agricultural land ...
Page 40
... factor of 2 but no more . At the left extreme of the diagram , if the material standard falls to zero , the death rate is shown as rising by a factor of 3. It is possible that further examination will show that this relationship should ...
... factor of 2 but no more . At the left extreme of the diagram , if the material standard falls to zero , the death rate is shown as rising by a factor of 3. It is possible that further examination will show that this relationship should ...
Page 43
... factor of 2 per person on a world - wide basis . At the left edge of the diagram , death rate rises by a factor of 30 for ... factors should be examined not only individually but also in combination . Would the effect of simultaneous ex ...
... factor of 2 per person on a world - wide basis . At the left edge of the diagram , death rate rises by a factor of 30 for ... factors should be examined not only individually but also in combination . Would the effect of simultaneous ex ...
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