There once was a PC computer game called
Theme Park
and
if I ever needed to know how retail is really done, then I found the right place to study right there 
for example, if ̶c̶h̶i̶p̶s̶ French fries are very cheap and heavily salted, price gouging drinks is easy. Especially when selling drinks that are mostly ice ... sell the junk food outside the intentionally long queue to big ride and children may sick up when they get off the ride. If there's not enough nearby maintenance crew to clean up the vomit immediately, other children will see it and sick up until it becomes a vomit storm in my theme park
anyway that's what I heard about the game.