Visualeconomics has an engaging visual on some of the costs we might associate with celebrating Independence Day in the U.S. Included is information on where various parts of the traditional mid-summer cookout come from. As I looked at the chart, I thought "what would our celebration cost if we imposed trade barriers between the states - depending totally on locally grown or produced items? Alternatively, how would we celebrate differently if it weren't for ideas like comparative advantage, productivity and specialization?"
It's just a thought as we pass the "mid-point" of summer and start thinking ahead (the local stores have their "back-to-school" displays up).