Around 45% of teenagers in the UK regularly consume high-caffeine energy drinks. The frequent consumption of these drinks has been linked to increased anxiety, sleep deprivation, and tooth decay among young people.
To curb this consumption, the government has implemented a 15% tax on the retail price of energy drinks containing more than 150mg of caffeine per litre.
Briefly explain one reason why the high consumption of energy drinks can create an external cost.
