WASHINGTON - Yes, you can buy happiness ? especially if the money saves you time. People who dole out cash to save time on things like housekeeping, delivery services and taxis are a little bit happier than those who don't, new research finds. Researchers surveyed more than 6,000 people in four countries and also ran an experiment, giving people $40 for two weeks. One week, they had to buy something material, like a shirt. The next week, they paid ...