Tim Harford writes about the difficulties in suppressing markets, in this case, for unhealthy food sold at schools:
These days schools are trying to outlaw the unhealthy options, but some markets are irrepressible. William Guntrip is a 13-year-old boy whose Northamptonshire school banished vending machines and tuck shop food in favour of nutritious offerings at the canteen. Guntrip spotted a market opportunity and has been buying soft drinks and sweets and reselling them in his school playground. The school is trying to stop him and claims that most students are happy with the new regime, although if that was true then Guntrip wouldn’t be making ₤50 a day.
High prices, entrepreneurship and mathematics. Sounds like a win-win.