Pretty sure there is nothing out of the box that will allow you to calculate a price as a function of deal volumes – or the ratio of volumes across a set of deals.
I think you could only do in the following steps.
1. Create an index object to hold the weightings as an input component of a custom price curve – initially update this manually.
2. Write a script to calculate and update the index manually.
3. Combine these as a custom Curve Constructor.
And I only say do the latter as a separate step because it may be easier to prototype the functionality as a JVS task script.
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