You want to know how much share is lost when you increase price and where it goes. You also want to know how much is gained when price is lowered and where it is from. This is how to do it:
1. Give set of options with corresponding prices.
2. Responden is asked to choose product to buy
3. If they choose your product then price is increase. Repeat the step until they switch to other product.
4. If they dont choose your product then price is lowered. Repeat the step until your product is chosen.
This is an example about water bottle category and you are the owner of brand C / option no 3 in the set, see how price is increased/lowered depending on respondent choice.