Penny started a business that sells flower barrettes called Penny Blossoms. Penny asks Sheldon to help her improve her manufacturing process, so they sing while working in order to increase productivity.
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.
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This clip highlights the Ford Model T and explains how the invention of the assembly line has made it the first car affordable to the masses. It also illustrates how the assembly line improved manufacturing processes and led to job specialization within factories.