How much money do we need to be happy? Should we move heaven and earth to earn six figures, or can we be just as happy with less? Harry gets some answers from Matt Killingsworth, who created an app to track happiness in real time. Harry also learns why paying for experiences may be key to finding joy and tests that theory on a high-flying trapeze with help from Trapeze School New York. If you enjoy Margins of Error, CNN would love to hear from you. Please visit: cnn.com/margins to take a brief survey. To learn more about how CNN protects listener privacy, visit cnn.com/privacy