A seller of hula hoops finds that no one is purchasing his items, so he lowers the price in an attempt to increase demand. His price changes don't make a difference. When a boy finds a stray hula hoop and plays with it in front of his peers, all of the kids suddenly want one, and the hula hoop becomes a desireable product.

Amy is mad at Sheldon, and he goes to the jewelry store with Penny to buy Amy something. Sheldon hints to the salesperson that diamonds are carbon just like charcoal, but it's only their molecular arrangement that makes them valuable. When the salesperson tells Sheldon that everything is on sale, Sheldon is suddenly more interested in a pocket watch he was previously considering.

When a product is in high demand, a manufacturer is obligated to charge a little more to pay back the investors who took a risk on the product. Watch Warren Buffett’s Secret Millionaires Club on the Kid Genius channel on Xfinity. Visit SMCKIDS.COM for webisodes, comics, games, and more!

Howard comes up with an idea for an app to solve differential equations.

Peter Gregory explains his plan to invest in sesame seeds in Indonesia due to a projected global shortage.