A mechanic builds an engine and then sells it to a customized body shop for $7,000. The body shop installs the engine in a car and sells the car to a dealer for $20,000. The dealer then sells the finished vehicle for $35,000. A consumer drives off with the car. By how much does GDP increase? What is the value added at each step of the production process? How does the total value added compare with the amount by which GDP increased?