A new Netlogo model that implements Wilhite’s (2001) model of bilateral exchange in a small world has been added to the computational labs section of the site. The model implements most of the features of Wilhite’s original model.

A lab assignment that works in conjunction with the Wealth Distribution model of the NetLogo sample libriary is now available. The Netlogo model implements one aspect of Epstein and Axtell’s Sugarscape world from Growing Artificial Societies.

A lab assignment that works in conjunction with the Prisoner Dilemma Basic Evolutionary model of the NetLogo sample library is now available. The model implements a very simple evolutionary model where agents play a PD game with their neighbors and then imitate their neighbor who has the best performance period to period.

The IPD model has been updated to work with NetLogo 4.0.3.

The ZI-Trading model has been updated to work with NetLogo 4.0.3.

A series of minor updates to the Information section of the model (with thanks to Prof. Leigh Tesfatsion for making the suggestions). Basically, the information section now more clearly explains how the model works. The changes have also been reflected in the lab report pdf and the homework pdf files. The lab report and homework pdf's have also been changed to make them course independent.

The ZI-trading model has been changed to reflect the market mechanism used by Gode & Sunder (1993). The original version of the model posted in the summer of 2006 worked by randomly matching a buyer and seller each tick of the clock. The buyer and seller randomly formed their respective bid and ask with a positive profit constraint (ZI-C). If the bid and asked cross, the transaction price was randomly set between the bid and ask. Now the model uses the simple order book described on pages 121-122 of Gode and Sunder (1993).
Read More...