http://freakonomics.com/podcast/mattress-store-bubble/ http://freakonomics.com/podcast/mattress-store-bubble/ mentions that a mattress store only has to sell 1

http://freakonomics.com/podcast/mattress-store-bubble/ http://freakonomics.com/podcast/mattress-store-bubble/ mentions that a mattress store only has to sell 1 mattress per day to be profitable, now that's a profit margin.