1. Why is this an equilibrium (video of cheetahs)?
2. The real Hayekian answer should be, and sometimes was, nominal gdp targeting, to minimize price distortions. There is much more on Hayek and nominal gdp here (pdf).
3. Via Chris F. Masse, Pepsi Social Vending System Spam Markets in Everything. Egads, can’t you just buy a soda? What’s wrong with monetary exchange?
5. Brazil is massively violating PPP, I can attest to this.