World dynamicsWright-Allen Press, 1971 - 142 pages |
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Page 38
... usage rate NRUR multiplied by the time interval between compu- tations . An initial value is needed for each level variable . We define the natural- resource - usage rate NRUR in 1970 as being 1 natural resource unit per person . This ...
... usage rate NRUR multiplied by the time interval between compu- tations . An initial value is needed for each level variable . We define the natural- resource - usage rate NRUR in 1970 as being 1 natural resource unit per person . This ...
Page 39
... USAGE RATE ( NATURAL RESOURCE UNITS / YEAR ) NATURAL RESOURCES , INITIAL ( NATURAL - RESOURCE UNITS ) 3.9 Natural - Resource - Usage Rate NRUR Natural - resource - usage rate NRUR is determined by the population P multi- plied by the ...
... USAGE RATE ( NATURAL RESOURCE UNITS / YEAR ) NATURAL RESOURCES , INITIAL ( NATURAL - RESOURCE UNITS ) 3.9 Natural - Resource - Usage Rate NRUR Natural - resource - usage rate NRUR is determined by the population P multi- plied by the ...
Page 74
... usage ( or increase the assumed initial supply ) to see which mode of behavior next appears . 4.3 Pollution Crisis In a model of a social system , structure and numerical values can be changed to determine how the system behavior ...
... usage ( or increase the assumed initial supply ) to see which mode of behavior next appears . 4.3 Pollution Crisis In a model of a social system , structure and numerical values can be changed to determine how the system behavior ...
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
accumulation action actual agriculture appear assumed assumptions average become behavior billion birth rate capital investment Capital-investment cause Chapter consequences continue created crowding curve death rate decline defined depends described developed discard discussed dynamic effect environment equations equilibrium examine existing expect factor falling Figure food production food ratio forces fraction further future gives greater grow growth higher improve increase indicated industrialization influence initial land less limit LOGICAL FUNCTION loop lower material standard means mode MULTIPLIER DIMENSIONLESS natural resources natural-resource normal NREM NRUN1 occurs ORIGINAL peak person policies pollution crisis pollution ratio POLN1 POLR population possible present pressures probably processes raise rate normal reaches reduced relationship remaining represents result rise sector shortage shown shows social systems space standard of living stop structure suppressed TABLE taken tion units usage variable world system