Social Cognitive Theory, Problem-Focused and Emotion-Focused Coping

People seem to differ in their “moods.” Some people are commonly “upbeat” and “lively.” Others seem lower in energy. Some people seem commonly to be depressed. How does social cognitive theory explain these individual differences? Or does it? Might this be a limitation to the social-cognitive approach? What are your thoughts about problem-focused & emotion-focused coping?