Ben hired Lewis to drive his racing car in a race. Tuan, a friend of Lewis, promised to pay Lewis $3,000 if he won the race. Lewis won the race, but Tuan refused to pay the $3,000. Tuan contended that no legally binding contract had been formed because he had received no consideration from Lewis for his promise to pay the $3,000. Lewis sued Tuan for breach of contract, arguing that winning the race was the consideration given in exchange for Tuan’s promise to pay the $3,000. What rule of law discussed in this chapter supports Tuan’s claim? Explain.