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This overview delves into the Alife metaphor, discussing Tierra, Darwin's postulates, urban legends, and the cha-ching of evolution. Explore ways variability is introduced, self-replication, and the impact of viruses on natural selection. Discover A-life tautologies and the intersection of genetic evolution with economics.
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Eric Dimperio 1/31/2005 Extending the Alife metaphor
Overview • Tierra: quirks and challenges • Darwin's postulates • Planes, trains, and automobiles • Urban legends • Cha-ching $$$
Evolution is hard to stop • Tierra allows evolutions even when all mutation is stopped • Sloppy Replicators • System Errors • The Reaper • What other ways can variability be introduced other than mutation and sexual reproduction?
Is self-replication necessary? • “Self-replication is critical to synthetic life because without it, the mechanisms of selection must also be pre-determined by the simulator. Such artificial selection can never be as creative as natural selection. The organisms are not free to invent their own fitness functions.” - Tom Ray • What about viruses? • Doesn't natural selection still succumb to some grand fitness function?
A-life Tautology • That which survives, persists. • That which reproduces, increases its numbers. • Things change.
Darwin's Postulates • More individuals are produced than can survive • Variation among individuals • Variable traits are inherited • Variable traits affect an individual's chances for survival and reproduction
Cha-Ching $$$ • Essays on Genetic Evolution and Economics (Burnham, T. 1997) • Evolutionary Economics • http://www.business.aau.dk/evolution/ • Nelson and Winter • Evolutionary Theory of Economic Change (1982) • Kwasnicki and Kwasnicka • http://prawo.uni.wroc.pl/~kwasnicki/e-model.htm
Industrial dynamics • Kwasnicki and Kwasnicka • Firms producing similar products are defined by a genotype. These are policies regulating price, R&D, investmenst, modernization of product, etc. • Variability is introduced by: • mutation (moderate modification) - autonomous research, in-house development • recombination, imitation • transition • transposition • recrudescence - search for radical novelty through reshaping of the active set of routines (large number of transpositions and/or frequent modifications by means of mutation)
Software tools • Laboratory for Simulation Development (lsd) • Maple • MEGA (Molecular Evolutionary Genetics Analysis) for phylogenetics • Sugarscape • SWARM
Planes, Trains, & Automobiles • More individuals are produced than can survive • Variation among individuals • Technology, materials, style • Variable traits are inherited • Incremental changes of old models • New models that 'borrow' from old • Variable traits affect an individual's chances for survival and reproduction • trends