World dynamicsWright-Allen Press, 1971 - 142 pages |
From inside the book
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Page 18
... cause the levels to change . A level accumulates the net quantity that results from the flow rates that add to and subtract from the level . The system levels fully describe the state or condition of a system at any point in time ...
... cause the levels to change . A level accumulates the net quantity that results from the flow rates that add to and subtract from the level . The system levels fully describe the state or condition of a system at any point in time ...
Page 22
... cause population to increase , remain stable , or decline . The birth loop in Figure 2-2 is positive feedback in character and generates population growth . An increase in population P causes , by way of the dashed information line , an ...
... cause population to increase , remain stable , or decline . The birth loop in Figure 2-2 is positive feedback in character and generates population growth . An increase in population P causes , by way of the dashed information line , an ...
Page 95
... cause that is plausible according to the lessons we have learned from simple systems , although this apparent cause is usually a coincident occurrence that , like the trouble symptom itself , is being produced by the feedback - loop ...
... cause that is plausible according to the lessons we have learned from simple systems , although this apparent cause is usually a coincident occurrence that , like the trouble symptom itself , is being produced by the feedback - loop ...
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