Distinguish between public goods and private goods.
The similarities and differences between saving the atmosphere and the oceans, making progress in research, having a common currency, and building roads and airports, all of them involving the provision of public goods.
Why it may be so difficult to make people contribute voluntarily to the provision of public goods.
What the "the tragedy of the commons' is.
Why public expenditure expands over time.
Begin to think of politics as a compound of rules and decisions for the provision of public goods.