Alcohol as an example of a de-merit good
You might find this news report from KL.FM (a radio station in King's Lynn) about the self-regulated sales of 'strong booze' in Ipswich an excellent example of a policy to deal with de-merit goods. Alcohol is a prime example of a de-merit good and a common student response regarding government policies to reduce its consumption often centres around the use of taxation and age-based prohibition. A good evaluative answer to questions relating to government policy would mention the fact that alcohol remains a popular product despite its obvious issues and might also discuss how the over-consumption of alcohol could be linked to something more cultural (compared to, say, France) - hence the need for something a little more creative than blanket bans or high duties. I would want to ask my students questions such as 'what are the costs to society' mentioned within the report and why might the targeting of high-strength alcoholic drinks be a more affective policy then banning sales of all alcohol?