World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 33
... BIRTH RATE ( PEOPLE / YEAR ) DEATH RATE ( PEOPLE / YEAR ) POPULATION , INITIAL ( PEOPLE ) 1 , L 1.1 , N 1.2 , C 3.2 Birth Rate BR The birth rate is part of the positive - feedback loop shown in Figure 2-2 . Basic birth rate depends on ...
... BIRTH RATE ( PEOPLE / YEAR ) DEATH RATE ( PEOPLE / YEAR ) POPULATION , INITIAL ( PEOPLE ) 1 , L 1.1 , N 1.2 , C 3.2 Birth Rate BR The birth rate is part of the positive - feedback loop shown in Figure 2-2 . Basic birth rate depends on ...
Page 34
... rate normal DRN . Taking a world population of 1.6 billion in 1900 and a world population of 3.6 billion in 1970 , the cumulative growth rate has averaged 1.2 % per year . This is the difference between the birth rate and the death rate ...
... rate normal DRN . Taking a world population of 1.6 billion in 1900 and a world population of 3.6 billion in 1970 , the cumulative growth rate has averaged 1.2 % per year . This is the difference between the birth rate and the death rate ...
Page 46
... birth rate , especially in the critical region where the population is undernourished . It appears that the world has normally existed in that sensitive region where food regulates birth and death rates so that population maintains its ...
... birth rate , especially in the critical region where the population is undernourished . It appears that the world has normally existed in that sensitive region where food regulates birth and death rates so that population maintains its ...
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