Not comparable. The markets can still charge wherever they want, but it needs to be priced per item and not per customer. In your house counterexample, you could set whatever list price you want.
I updated my comment - it wasn't clear. I wasn't referring to the price of houses, but to the price of goods sold to people living in that zip code.
I updated my comment - it wasn't clear. I wasn't referring to the price of houses, but to the price of goods sold to people living in that zip code.