“…Since the establishment of subjective well‐being measures in the late 1980s, researchers have begun to look at both internal factors (e.g., habitual patterns of thought) and external factors (e.g., cultural lay theories) to answer more substantive questions, such as “Who is happy?” and “When do people feel happy?” On the one hand, happiness and well‐being are subjective states that are constructed from relatively stable internal or personal factors, such as genetics (De Neve, Christakis, Fowler, & Frey, ; Weiss, Bates, & Luciano, ), personality (see DeNeve & Cooper, ; Lucas, for review), material satisfaction (Larsen & McKibban, ), promotion‐prevention focus (Higgins, Grant, & Shah, ), locus of control (Helzer & Jayawickreme, ) and emotion regulation (Gross & John, ). On the other hand, engaging in activities (Sakawa, Ohtake, & Tsutsui, ) such as expressing gratitude, counting one's blessings, and thinking about an ideal future, also predicts happiness (see Lyubomirsky & Layous, for a review), thus leading to the occasional application of interventionist approaches to enhance happiness.…”