The lack of state-to-state border controls has often served as an excuse to increase federal regulation of all states in the name of "uniform" laws. We've seen this with guns, drugs, alcohol, and migrants.
After very quickly becoming an advanced economy, South Korea is experiencing declining growth and labor productivity. The culprit, as usual, is government intervention in the market to favor certain interests.
Why do we have money in the first place? Where does it come from, and what determines its form? What qualities make for a good money? What role do banks play—is it something other than what money itself does for us?