[There is neither a family nor a company on the planet which will engage in the analysis you suggest for the pricing of a flat panel LCD.]
Oh, ye of little faith !
These decisions are made intuitively by every consumer with every purchase. Every purchase contains a subconcious evaluation of the price of a product relative to all other items they could purchase. That's what a market IS -- consumers choosing and dictating the prices by their choices.
Do you honestly believe that a consumer doesn't look at two items -- even completely unrelated items -- and decide which one gives them the most bang for their buck ? Do you think people look at a restaurant menu and decide what to eat solely based on what sounds good ? So if they are in the mood for a steak, they will never be swayed to something else based on the price differential ?
What a strange world you must live in.
If ANYONE deviates by maximizing their own situation under a new, untested tax regime, then BY DEFINITION, prices MUST rise higher than the levels that you claim.
It is not me living in the stange world ... I EXPECT people to behave outside the parameters of the plan.