*A (hopefully measured) rant about sociobiology / pyschology / behavioural modelling, in response to an email on the SIMSOC list, rehashing themes covered on this blog*:

This is probably a foolish venture (given my math ignorance) but here's some thoughts on an economic random walk. (Any pointers to elementary fuck-ups / blindingly obvious things I'm missing appreciated.) I've come across the graphs here in each of the simple models I've done of trade exchanges. This one isn't a real trade exchange - it's had price decisions removed entirely. So apart from the limit on the amount of money in the economy and the requirement that money is 'exchanged', they *are* random walks. It's like this. We start with:

- 100 people, 100 pounds each (so the amount of money in this 'economy' remains constant: the mean is always 100.)
- Run for 200,000 days
- On each day, each person randomly chooses someone, and gives them a pound if they have a pound to give. If they don't, on to the next person's random choice.

(See links below for graphs and code.)

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