Homer Price (The Doughnut): Use the story of Homer Price and his problem with the doughnut machine to teach a lesson on supply and demand. Then make the connection to the California Gold Rush and the cost of thins in California.  

To Equip an Expansion: What did it take for Lewis and Clark to set out on their journey? This is a great link to compare money now and then. Just how far do you think $2,500 would go in 1803? How much would the same supplies cost today?