World dynamicsWright-Allen Press, 1971 - 142 pages |
From inside the book
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Page 18
... system structure tell us that two kinds of variables will be found - levels and rates . The levels are the accumulations ( integrations ) within the system . The rates are the flows that cause the levels to change . A level accumulates ...
... system structure tell us that two kinds of variables will be found - levels and rates . The levels are the accumulations ( integrations ) within the system . The rates are the flows that cause the levels to change . A level accumulates ...
Page 19
... levels were chosen as the cornerstones on which to build the system structure : Population Capital investment Natural resources Fraction of capital devoted to agriculture Pollution Each of these levels represents the principal variable ...
... levels were chosen as the cornerstones on which to build the system structure : Population Capital investment Natural resources Fraction of capital devoted to agriculture Pollution Each of these levels represents the principal variable ...
Page 32
... system has been given in Chapter 2. The de- tailed description follows . The reader should examine the assumptions ... Levels provide the system " memory " or continuity that carries the past into the future . An initial value must be ...
... system has been given in Chapter 2. The de- tailed description follows . The reader should examine the assumptions ... Levels provide the system " memory " or continuity that carries the past into the future . An initial value must be ...
Contents
Introduction | 1 |
Structure of the World System | 17 |
A World Model Structure and Assumptions | 31 |
Copyright | |
6 other sections not shown
Common terms and phrases
1970 conditions accumulation agricultural land assumed assumptions behavior birth rate normal birth-control program BRFM BRN1 capital investment CAPITAL UNITS CAPITAL UNITS/PERSON CAPITAL-INVESTMENT DISCARD capital-investment multiplier capital-investment ratio CAPITAL-INVESTMENT-IN-AGRICULTURE FRACTION cause Chapter CIAF CIGN1 Club of Rome coefficient computer model crowding ratio curve death rate normal decline DRFM dynamic ECIR effect effective-capital-investment ratio equations equilibrium exponential growth food production food ratio food supply FPMT FRACTION/YEAR in-agriculture fraction increase industrialization INTERPOLATION limit LOGICAL FUNCTION material standard mental models MULTIPLIER DIMENSIONLESS natural resources natural-resource Natural-resource-usage rate negative loop NR=N NREM NREMT POLAT pollution absorption pollution crisis POLLUTION UNITS pollution-absorption population and capital population density PRESENT ORIGINAL pressures QL-Q ratio CIR RATIO DIMENSIONLESS result rise Section sector shortage social systems SQUARE KILOMETERS standard of living system levels TABHL TABLE LOOK TIME.K tion units per person UNITS/PERSON/YEAR UNITS/YEAR usage rate variable world model world population world system