Whisk together olive oil, lime juice, vinegar and cumin.
Add green onion, bell pepper, cilantro, corn, and black beans. Mix well. Cover, refrigerate.
Boil chicken broth in the microwave. Stir in couscous. Cover, let stand 5 minutes. Fluff with fork. Allow to cool to room temperature.
Combine cooked couscous with dressing and vegetable mixture. Salt and pepper to taste.