World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 2
... exponential " growth . But exponential growth cannot continue indefinitely . Pure exponential growth possesses the characteristic of behaving according to a " doubling time . " Each fixed time interval shows a doubling of the relevant ...
... exponential " growth . But exponential growth cannot continue indefinitely . Pure exponential growth possesses the characteristic of behaving according to a " doubling time . " Each fixed time interval shows a doubling of the relevant ...
Page 3
... Exponential growth is only significant in comparison to some relevant limit . The power and nature of exponential growth are best appreciated through an example . Suppose , for purposes of illustration , that we start with a population ...
... Exponential growth is only significant in comparison to some relevant limit . The power and nature of exponential growth are best appreciated through an example . Suppose , for purposes of illustration , that we start with a population ...
Page 5
... exponential growth . It begins to examine the transition from a world of growth to a world in equi- librium . It is surprising enough , as in Figure 1-2 , when exponential growth suddenly thrusts against fixed limits beyond which it ...
... exponential growth . It begins to examine the transition from a world of growth to a world in equi- librium . It is surprising enough , as in Figure 1-2 , when exponential growth suddenly thrusts against fixed limits beyond which it ...
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