> For example, try designing a tax system that is both fair and efficient with respect to agricultural income and tech income... It won't be simple.

I love these armchair opportunities for college-level challenges without the admission fees, I'll bite. Step 1: disallow corporation as a legal taxable entity, private ownership only. Step 2: Subtract expenses from income. Step 3: Divide by 10. Step 4: If more than zero, send a check.

"Fair and efficient" in terms of opportunity is easy. In terms of outcome is a fool's game IMO