1. Which income tax is the most efficient and which is the most inefficient, and why: a tax on labor income, a tax on capital income, or a tax on land income?

2. Comparing a tax on labor income, a tax on capital income, and a tax on land income, who pays more of each tax, and why?

3. Explain why Jordan Spieth pays his own Social Security tax and the PGA (the Professional Golfers’ Association) pays none of it.