For a refresher on supply and demand, see Paradise Lost? - Price Controls in Hawaii from Rofasix, where he discusses (you guessed it - price controls).Again, there are lots of iteresting things there. These just caught my eye.
In further "gasblogging", David Tufte at VoluntaryXchange gives us Gas Station Profits.
And finally, Searchlight Crusade's talks about Levels of Mortgage Documentaton. It's worth reading if you're thinking of buying a house.