The Free Market, Supply & Demand, determine everything. The Iron-clad Laws of Economics are always in force. But in the big cities, where Liberalism has been in control for decades, bad economic policies distort, supress, and overlay Free Market forces.
That hot dog will cost more if the ballpark allows religion to govern the manufacturing process. The requirement that a hot dog be Kosher will add unnecessary steps and expense so the hot dog will cost more.
If a Bastion of Liberalism declares itself a Sanctuary City, for example, Free Market forces will be distorted by an influx of poor people who need food, clothing, shelter, medical care, entertainment, etc. They can't pay for it so someone else has to. To make matters worse, since the "Illegals" are illegal, almost everything they do is done illegally. The Cost of Living will be higher in that area even if the Left-wing voters don't understand why.