Consider an economy which produces and sells, among a host of other things, 100 million T-shirts a year. The average T-shirt begins life when a farmer plants seeds she put away last year, waters them, harvests the cotton, then sells the cotton to a mill for $0.75, which sells the fabric to a T-shirt factory for $1.50, which sells the T-shirt to a wholesaler for $5, who sells it to Nordstrom for $10, which finally sells it to you for $17. Determine the impact of T-shirts on annual GDP by calculating the total output of the entire production process. Then compare it to total spending on final T-shirts. What do you notice about the two?