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-trding 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).
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