World DynamicsThe "system dynamics" approach to economics as developed at MIT. |
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Page 44
... average population density . The land area LA is taken as 135 million square kilometers , and the 1970 average population density normal PDN is 26.5 people per square kilometer . CR.K = ( P.K ) / ( LA⭑PDN ) LA = 135E6 PDN = 26.5 15 , A ...
... average population density . The land area LA is taken as 135 million square kilometers , and the 1970 average population density normal PDN is 26.5 people per square kilometer . CR.K = ( P.K ) / ( LA⭑PDN ) LA = 135E6 PDN = 26.5 15 , A ...
Page 52
... average intensity of capital in 1970. The shape of the curve assumes that capital is not uniformly distributed in the hands of the population . As capital begins to accumulate , it is assumed to concentrate in the hands of a few people ...
... average intensity of capital in 1970. The shape of the curve assumes that capital is not uniformly distributed in the hands of the population . As capital begins to accumulate , it is assumed to concentrate in the hands of a few people ...
Page 61
... average about equal to that now in the United States . It is assumed here that such an improvement could be interpreted as increasing the average world quality of life by a factor of 3. There is no “ right ” vertical scale or steepness ...
... average about equal to that now in the United States . It is assumed here that such an improvement could be interpreted as increasing the average world quality of life by a factor of 3. There is no “ right ” vertical scale or steepness ...
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