This is all very interesting and totally different from what I would do if I started a store. I would price my items simply based on supply and demand (profit maximization).
If no one wants to buy my salt at my high price causing me to lower the price of salt, I wouldn't automatically raise the price of my other goods. That's because we know from the Law of Demand (downward slope of the demand curve) that artificially raising the price of a good would lower quantity demanded, increase surplus, and reduce profit/revenue.
http://en.wikipedia.org/wiki/Supply_...ilibrium_Point
This is the generally accepted theory for perfectly competitive markets (ex. not monopolies).