Gary is a worker in a factory. He goes to the factory on foot every day. Today he comes back home and is very angry. His wife asks him, "Why are you angry, Gary?" "A bus ticket cost three dollars last week, but now it costs two dollars," he says. "It's good. Going by bus is cheaper now," his wife says. "Yes, it is," Gary says. "But I always walk to work in the morning, and walk home in the afternoon. Last week I saved six dollars every day, but now I only save four dollars."