## World Dynamics |

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Page 13

The foundation was laid in the 1930's when Vannevar Bush built his differential

analyzer to solve the

set of

...

The foundation was laid in the 1930's when Vannevar Bush built his differential

analyzer to solve the

**equations**of certain simple engineering problems. Such aset of

**equations**is a model of the system they represent. Such a model describes...

Page 31

The nature of this world model is given here in two equivalent forms— text and

to ignore the

The nature of this world model is given here in two equivalent forms— text and

**equations**. Those readers who are not familiar with algebraic notation may wishto ignore the

**equations**that are placed at the end of each subsection.Page 131

A

written in the notation for the DYNAMO compiler. For complete information see

the DYNAMO User's Manual by Alexander L. Pugh, III, third edition, M.I.T. Press, ...

A

**Equation**Notation The**equations**as printed in Chapter 3 and Appendix B arewritten in the notation for the DYNAMO compiler. For complete information see

the DYNAMO User's Manual by Alexander L. Pugh, III, third edition, M.I.T. Press, ...

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### Contents

Introduction | 1 |

Structure of the World System | 18 |

A World Model Structure and Assumptions | 31 |

Copyright | |

6 other sections not shown

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### Common terms and phrases

1970 conditions accumulation assumed assumptions average behavior billion birth rate normal birth-control program BRN1 capital accumulation capital investment CAPITAL UNITS CAPITAL-INVESTMENT DISCARD capital-investment ratio CAPITAL-INVESTMENT-IN-AGRICULTURE FRACTION cause Chapter CIAF Club of Rome coefficient computer model crowding ratio curve death rate normal decline dynamic ECIR effect effective-capital-investment ratio environment equations equilibrium exponential growth falling feedback loops Figure food production food ratio food supply increase industrialization influence INTERPOLATION IONLESS limit LOGICAL FUNCTION material standard mental models mode MULTIPLIER DIMENSIONLESS natural resources natural-resource-usage rate negative loop NREM pollution absorption pollution crisis pollution POL pollution ratio POLR POLLUTION UNITS pollution-absorption population and capital population control population density population growth pressures processes ratio CIR RATIO DIMENSIONLESS result Section shortage shows social systems SQUARE KILOMETERS standard of living structure system levels TABHL TABLE LOOK tion unit per person UNITS/PERSON UNITS/PERSON/YEAR UNITS/YEAR usage rate variable world model world population world system