This “experiment” won’t actually tell us anything useful, because of the relatively unique nature of the Seatac economy: (1) The airport isn’t going anywhere, (2) businesses within the airport already have skewed/inflated prices because they have a captive audience/customer base, and (3) this is unlikely to diminish that customer base, for the simple reason that virtually no one chooses where to travel based on the prices of amenities at the destination airport.
Is this only for the airport? Or the entire Seattle-Tacoma area? This means that a full time McDonalds job will pay over $30k per year. It also means that a Happy Meal will cost $6-7. Will folks shy away from fast food when it passes $30 for a family of four?