It was called the 18% price protection policy program where concessionaires had to quarterly list 3 comparable vendors for each item sold showing how their item offered was only less than 18% above that of those found within a 10 mile radius of the airport. In reality, it was too much asked of low skilled and low margin vendors with power to enforce not being exercised due to managements prioritization of more pressing matters.
In reality, there was little by way of enforcement, it was too much regulation to pass down to those vendors even, with that being only 1 of 5-10 policies an excel sheets they had to provide quarterly data on, entered manually. They vendors had so much turnover themselves and employees who didn't specialize in providing that sort of data, they would always fall behind with all the policies and regulation they had to comply with that enforcing it on them was hollow and without power. And when they did provide data, it was poorly formatted, required man hours to read and research and in the end might not even have been a valid "comparable" data that was provided, but, to verify their data provided would require manual audits of physically inspecting 10-100 individual comparables that were given that it was a nightmare, and thus, never got done. There wasn't enough staff at either the vendor nor the airport authority to properly see the implementation of the price protection policy.
The city could technically use its power to make it a priority, but, there were always much more urgent matters at same position that it was a on the back burner, it seemed.