World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 48
... agricultural land is left . Occupancy seems often to use the best land , and so the allotment of land of lower quality for food growing will increase the effect of crowding on food production . Population uses land for housing , working ...
... agricultural land is left . Occupancy seems often to use the best land , and so the allotment of land of lower quality for food growing will increase the effect of crowding on food production . Population uses land for housing , working ...
Page 49
... food . With no capital investment , food production is still possible . It would imply a higher use of labor . Zero capital investment is here taken to decrease the food production of the world by 50 % . At the high extreme for capital ...
... food . With no capital investment , food production is still possible . It would imply a higher use of labor . Zero capital investment is here taken to decrease the food production of the world by 50 % . At the high extreme for capital ...
Page 106
... Agricultural Productivity The hope of much of the world rests on greater food production . Desert land is reclaimed . Better crop plants are developed . Irrigation dams are constructed . Forests are cleared . What is the history of such ...
... Agricultural Productivity The hope of much of the world rests on greater food production . Desert land is reclaimed . Better crop plants are developed . Irrigation dams are constructed . Forests are cleared . What is the history of such ...
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