Wyrdstone Hunter and Market skills

Domowoj

Private
I am wondering if it is possible to get an idea of how the Wyrdstone Hunter skill works in terms of game mechanics. And my next question is this: Let us say I have three characters in my warband with the Wyrdstone Hunter, Streetwise, and Haggle skills. Do these affects stack, giving me +60% chance to find rare items in the store,etc or how does this work?
 
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