More optional material for L09

1. This story from Planet Money illustrates supply and demand at work. It shows how the price of a ride on Uber increases during a snowstorm.
2. Read the article linked from this post: Pig market.  It discusses the effects of a virus that is killing young pigs and lower grain prices on the price of pork.
3. This article reports that the price of tickets to the Super Bowl is falling. The forecast today, 1 week out, is for temperatures between 35 and 30 with a 20% chance of precipitation. Perhaps that forecast makes watching the game (and the commercials) in the comfort of your home on your new big TV look better and better.
4. This article in the WSJ reports that propane prices rose as temperatures fell. It is a good introduction to supply and demand. It links higher prices to higher demand, mentions possible shortages, and has at least one example of a reduction in the quantity demanded.
5. This video shows how changes in demand affect the price of Hula Hoops.