What is the proper size and scope of government? Where can government intervention improve on the market? Does a market failure necessarily mean that government intervention is warranted? Can intervention make things worse? If the government intervenes in a market, how should it intervene? To what extent is public ownership of assets and businesses warranted?
The Equity premium puzzle. Can we explain the Equity Premium Puzzle? Why is it that observed average annual returns on stocks over the past century are higher, by approximately 6 percentage points, than returns on government bonds?
Do minimum wages cause unemployment? If so, how much? Whether or not they cause unemployment, are they an appropriate tool of economic/social policy (for example, could the same goals be better achieved through the tax and social security systems?)
What is the microeconomic foundation of inflation? or How do inflation arise from indiviudal agent decisisions?.