I am going to tell you about demerit goods and Mcdonalds company.
So, firts of full, demerit good it is a good where consumption of goods is more harmful than it's actually realised, therefore when people consume product, probably they have a harm on their health. Nowadays the most urgent demerit good it is a burger, fast food etc. Every day in many countries in the world people use fast food and the don't recognize, that it's really bad for their health.
Mcdonalds it is a main representative of demerit goods, and it's such a global company, it exists in many countries. So, Mcdonalds it is american company which created in 1940, it became the most popular food since 1947. Nowadays it is the largest food company in the world, their revenue makes up about 22 billion american dollars for 2008. It looks absolutely amazing, because many people know, that mcdonald burgers make a big harm on their health, but they still continue consume this products. Government in many countries try to decide this problem with obesity, for example, in USA, it becomes a political problem, people don't understand that they lose their health and pay money to this company. In some countries government banned Mcdonald cafes and restaurants, for example in my home country Kazakhstan, president has made a law, that in Kazakhstan won't be any Mcdonalds cafes, and I think that it is a great decision to avoid obesity. Also there is another problem, many years ago Mcdonalds company was a monopoly company, but few years ago, there appeared another fast food companies such as Subway, King Burger. It's a problem, because people have substitutes to one fast food company for another fast food company, if Mcdonalds make high prices on burgers, people will go to King Burger and over and over will be becoming fatty. But I think that the main problem in people, not in fast food companies, because people like this food and it is cheap food that's why people eat in fast food cafes. So, I think that government don't have to ban fast food companies, but maybe government can reduce create fast food cafes on every corner.