Thursday, October 11, 2007

What drives pressure?

In the last post, I showed the relationship between pressure and idea price change, assuming no ideas are sitting on the market at drop time. The three pressure factors are:
  • D1 - Downward force 1
  • D2 - Downward force 2
  • U - Upward force
D1 is simply the ratio between total idea market value and total player wealth. It is relatively stable, and currently sits around 0.45.

D2 and U are a bit more complex, as you can see in the chart below:

U appears to be directly related to the drop ratio, which is the average of the previous 10 drops divided by the number of ideas existing. D2 also shows that relationship, but it is much less clear -- there is another factor I haven't yet discovered.

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