For a limited-time promotion, urgency is usually more effective because it pushes people to act now rather than later. When customers see a countdown, an ending date, or a message that an offer will disappear soon, they are more likely to make a quick decision. Tracking response rates, click-throughs, and purchase timing shows how strongly urgency influences behavior. Analyzing when people buy during a campaign reveals whether deadlines create momentum or if interest fades over time. Exclusivity can still be powerful, especially for premium products, because it makes customers feel selected or special.