How do economists distinguish between public goods and private goods? Of what interest is the history of the lighthouse in clarifying alternative ways of tackling the problem of public goods?

Order Description
Be sure to answer the question set. Put the exact title of the essay at the top. Do not change the title. If you choose to answer it in a certain way which you believe is a reasonable approach put your argument for your approach in the introduction. The introduction is also the place where you may explain what you will and will not cover. You will probably want to write or re-write the introduction towards the end of your essay writing process.

Credit will be given for clarity of exposition. Any diagrams used should be carefully labelled and fully explained in the text. It is OK to paste in a diagram as a solution to drawing problems, but explain the diagram carefully yourself in your own terms.